A rotating baffle suitable for supercritical industrial steam extraction

Abstract

A rotating diaphragm suitable for supercritical industrial steam extraction belongs to a rotating diaphragm of a steam turbine. In order to solve the problem that the rotating ring in the existing diaphragm body is easy to deform, resulting in the rotating ring being stuck in rotation. The present invention comprises a steam seal ring, a steam seal body, a diaphragm body, a rotating ring and a cover ring; the steam seal ring, the steam seal body, the diaphragm body, the rotating ring and the cover ring are all annular structures, the steam seal ring is installed on the inner ring surface of the diaphragm body, the steam seal body is coaxially installed on the steam outlet side of the diaphragm body, the rotating ring is coaxially installed on the steam inlet side of the diaphragm body, and a positive pressure is generated on the diaphragm body, and a rotating friction pair is formed between the rotating ring and the diaphragm body; the cover ring is covered on the rotating ring and coaxially installed on the diaphragm body, and two upper and lower symmetrical pressure balance chambers are formed between the cover ring, the rotating ring and the diaphragm body, and the two pressure balance chambers ensure the constant positive pressure generated by the rotating ring on the diaphragm body. The present invention is mainly used to adjust the steam extraction capacity of high-power steam turbines.

Description

Technical Field

[0001] The invention belongs to a rotating baffle of a steam turbine, and in particular relates to a rotating baffle suitable for supercritical industrial steam extraction. Background Art

[0002] With the development of my country's economy, the market demand for cogeneration and central heating is increasing, and the corresponding large-scale steam turbines with adjustable steam extraction functions are very popular among users. The high-power steam turbine with rotating diaphragm to control steam extraction has a steam extraction capacity that can meet the needs of heat users and well meet the market demand for steam turbine cogeneration.

[0003] The traditional rotating diaphragm is limited by the use conditions of Deva alloy. The friction pair (Deva alloy) of the diaphragm body must be made of stainless steel, and it must also have a sufficiently high finish and hardness. The traditional diaphragm rotating ring is processed with stainless steel, and stainless steel must be quenched to achieve a sufficiently high hardness. After quenching, residual stresses such as machining and welding are difficult to remove, which poses a risk of deformation during operation. In the past, in the application of rotating diaphragms, problems such as the rotating diaphragm of old units often occurred, such as stuck operation, deformation of the rotating ring, and welding fracture of the rotating ring handle. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the existing baffle body has residual stress due to welding, machining and heat treatment during the production process, and the rotating ring is easily deformed due to uneven pressure between the front and back and the residual stress of the baffle body, which ultimately causes the rotating ring to rotate and become stuck; thereby providing a rotating baffle suitable for supercritical industrial steam extraction.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a rotating baffle suitable for supercritical industrial steam extraction, which includes a steam seal ring, a steam seal body, a baffle body, a rotating ring and a cover ring; the steam seal ring, the steam seal body, the baffle body, the rotating ring and the cover ring are all annular structures, the steam seal ring is installed on the inner ring surface of the baffle body, the steam seal body is coaxially installed on the steam outlet side of the baffle body, the rotating ring is coaxially installed on the steam inlet side of the baffle body, and generates positive pressure on the baffle body, and a rotating friction pair is formed between the rotating ring and the baffle body; the cover ring covers the rotating ring and is coaxially installed on the baffle body, and two upper and lower symmetrical pressure balance chambers are formed between the cover ring, the rotating ring and the baffle body, and the two pressure balance chambers ensure the constancy of the positive pressure generated by the rotating ring on the baffle body.

[0006] Furthermore, the partition body includes a partition outer ring, a partition inner ring and a plurality of partition stationary blades. The partition outer ring is coaxially sleeved outside the partition inner ring and forms an annular steam channel I with the partition inner ring. The plurality of partition stationary blades are evenly distributed in the annular steam channel I and divide the annular steam channel into a plurality of steam channel openings I; the rotating ring includes a rotating ring outer ring, a rotating ring inner ring and a plurality of rotating ring stationary blades. The rotating ring outer ring is coaxially sleeved outside the rotating ring inner ring and forms an annular steam channel II with the rotating ring inner ring. The plurality of rotating ring stationary blades are evenly distributed in the annular steam channel II and divide the annular steam channel II into a plurality of steam channel openings II; the number of the rotating ring stationary blades is the same as the number of the steam channel openings I on the partition body, and the cross-sectional area of ​​each rotating ring stationary blade is equal to the flow area of ​​each steam channel opening I.

[0007] Furthermore, the cover ring includes an upper cover ring and a lower cover ring, the upper cover ring and the lower cover ring are arranged opposite to each other up and down, and a guide notch is opened on one side of the lower cover ring; a rotating handle is arranged on the outer ring surface of the rotating ring, and the rotating handle is inserted into the guide notch on the lower cover ring and can move along the arc extension direction of the guide notch.

[0008] Furthermore, two annular friction belts are coaxially arranged on the steam inlet side end face of the partition body, and the two friction belts are friction belt I and friction belt II respectively. Two coaxial annular friction belts are arranged on the steam outlet side end face of the rotating ring, and the two friction belts on the rotating ring are friction belt III and friction belt IV respectively. The friction belt I on the partition body and the friction belt III on the rotating ring form a rotating friction pair I, and the friction belt II on the partition body and the friction belt IV on the rotating ring form a rotating friction pair II; the rotating friction pair I and the rotating friction pair II together form a rotating friction pair between the rotating ring and the partition body.

[0009] Furthermore, the friction belt I is located on the outer ring of the partition and is arranged close to the annular steam channel I, and the friction belt II is located on the inner ring of the partition and is arranged close to the annular steam channel I;

[0010] The friction belt III is located on the outer ring of the rotating ring and is arranged close to the annular steam channel II, and the friction belt IV is located on the inner ring of the rotating ring and is arranged close to the annular steam channel II.

[0011] Furthermore, the friction belt I and the friction belt II are two annular protrusions I integrally formed with the partition body, and the two annular protrusions I are respectively welded with Stellite alloy;

[0012] The friction belt III and the friction belt IV are two annular protrusions II made in one piece with the rotating ring, and the two annular protrusions II are sprayed with Cr3C2-NiCr metal ceramic coating.

[0013] Furthermore, the upper half of the upper cover ring, the upper half of the rotating ring and the upper half of the partition body form a pressure balance chamber, and the lower half of the lower cover ring, the lower half of the rotating ring and the lower half of the partition body form a pressure balance chamber. The two pressure balance chambers have the same structure, so one of the pressure balance chambers is used for description;

[0014] The upper half cover ring and the steam inlet side of the rotating ring outer ring form a sealed chamber I, and the steam outlet side of the rotating ring outer ring and the steam inlet side of the partition outer ring form a sealed chamber II; a plurality of balancing channels I are evenly opened on the upper half cover ring along its arc-shaped extension direction, and a plurality of radially arranged balancing channels II are evenly opened on the partition outer ring along its arc-shaped extension direction, and the balancing channel II is communicated with the steam channel opening I on the partition body; a plurality of axially arranged balancing channels III are evenly opened on the partition outer ring along its arc-shaped extension direction, and the number of the balancing channels II is twice the number of the balancing channels III; the balancing channel II on the partition outer ring is evenly divided into two parts, one part of the balancing channel II is communicated with the sealed chamber I through a plurality of balancing channels I, and the other part of the balancing channel II is communicated with the sealed chamber II through a plurality of balancing channels III, so the sealed chamber I is communicated with the sealed chamber II.

[0015] Furthermore, the side of the upper half cover ring facing the rotating ring is recessed inwardly, and two elastic sealing strips are respectively provided on the inner side wall of the upper half cover ring facing the outer ring of the rotating ring. The two elastic sealing strips are coaxially arranged radially and are respectively located above and below the recessed part of the inner wall of the upper half cover ring; the elastic sealing strips generate extrusion force between the upper half cover ring and the outer ring of the rotating ring.

[0016] Furthermore, the partition outer ring and the partition stationary blades are connected by welding, and the partition stationary blades and the partition inner ring are connected by welding.

[0017] Furthermore, the materials of the partition body, the rotating ring and the cover ring are all chromium-molybdenum alloy steel.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The partition body of the present application is changed from the original casting structure to a welding structure, which can reduce the residual stress in the partition body; at the same time, the partition body, rotating ring and cover ring are made of chromium-molybdenum alloy steel, which is convenient for machining and welding, and the chromium-molybdenum alloy steel has a temperature resistance of up to 500°C. The present application can operate safely for a long time at 400°C, and can avoid the problem of stuck rotation of the partition body, rotating ring and cover ring due to thermal deformation.

[0020] 2. The present application sets a pressure balance chamber so that the pressure on both sides of the rotating ring is balanced, and the positive pressure of the rotating ring on the partition body is reduced, thereby reducing the friction of the rotating friction pair between the rotating ring and the partition body, and further reducing the opening torque of the rotating ring. At the same time, due to the symmetrical arrangement of the two pressure balance chambers, the relative balance channels in the two pressure balance chambers are also in a symmetrical arrangement. The reasonable and symmetrical arrangement of the position and structural dimensions of the balance channels in the pressure balance chamber can not only meet the balanced connection function, but also avoid deformation and warping of the rotating ring due to uneven axial force caused by the unreasonable arrangement of the balance channels. At the same time, the weakening of the strength of the rotating partition by the balance channel should be reduced, so as to ensure the safe operation requirements of the rotating partition. In addition, an elastic sealing strip is set between the cover ring and the rotating ring. On the premise of ensuring the sealing effect of the sealing chamber I and the sealing chamber II, there is still enough yield capacity between the rotating ring and the cover ring to avoid the deformation of the rotating ring and the cover ring due to friction, which causes the jamming of the rotating partition. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, as a part of this application, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute improper limitations on the present invention.

[0022] Figure 1 It is a schematic diagram of the shaft side of the steam inlet side of the present application;

[0023] Figure 2 It is a schematic diagram of the axial side of the steam outlet side of the present application;

[0024] Figure 3 It is a schematic diagram of the internal structure of this application;

[0025] Figure 4 This is the main view of this application;

[0026] Figure 5 is a schematic diagram of the structure of the partition body;

[0027] Figure 6 is a side view of the present application;

[0028] Figure 7 yes Figure 4 Sectional view at AA in the middle;

[0029] Figure 8 It is a schematic diagram of the diaphragm body, the cover ring and the sealing chamber I in the pressure balance chamber being connected;

[0030] Fig. 9 It is a schematic diagram of the communication between the partition body in the pressure balance chamber and the sealing chamber II;

[0031] Fig.10 It is the temperature field cloud diagram of the rotating partition;

[0032] Fig.11It is the equivalent stress cloud diagram of the rotating partition;

[0033] Fig.12 It is the radial deformation cloud diagram of the rotating ring;

[0034] Fig.13 It is the axial deformation cloud diagram of the rotating ring.

[0035] Explanation of the accompanying drawings: 1. Steam seal ring; 2. Steam seal body; 3. Partition body; 301. Partition outer ring; 302. Partition inner ring; 303. Partition stationary blade; 304. Friction belt I; 305. Friction belt II; 306. Balance channel II; 307. Balance channel III; 4. Rotating ring; 401. Rotating ring outer ring; 402. Rotating ring inner ring; 403. Rotating ring stationary blade; 404. Friction belt III; 405. Friction belt IV; 406. Rotating handle; 5. Cover ring; 501. Upper half cover ring; 502. Lower half cover ring; 504. Balance channel I; 6. Pressure balance chamber; 601. Sealing chamber I; 602. Sealing chamber II; 7. Elastic sealing strip. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] See also Figures 1 to 13The embodiment of the present application provides a rotating baffle suitable for supercritical industrial steam extraction, which includes a steam seal ring 1, a steam seal body 2, a baffle body 3, a rotating ring 4 and a cover ring 5; in order to match the structural form of the steam turbine, the steam seal ring 1, the steam seal body 2, the baffle body 3, the rotating ring 4 and the cover ring 5 are all annular structures; in order to facilitate the assembly of the rotating baffle, the steam seal body 2, the baffle body 3, the rotating ring 4 and the cover ring 5 are all in the form of upper and lower halves, wherein the middle dividing surfaces of the baffle body 3 and the rotating ring 4 are connected by bolts to form a complete annular structure, and the cover ring 5 is a split annular structure;

[0040] like Figure 2 and Figure 6 As shown, the steam seal ring 1 is installed on the inner ring surface of the partition body 3 to ensure the steam seal gap between the partition body 3 and the rotor, reduce the air leakage loss, and improve the thermal efficiency of the whole machine.

[0041] like Figure 5 As shown, the material of the partition body 3 is chromium-molybdenum alloy steel, which is installed in the steam turbine and does not move. The partition body 3 includes a partition outer ring 301, a partition inner ring 302 and a plurality of partition stationary blades 303, wherein the partition outer ring 301 is assembled from two identical semi-ring bodies, and the partition inner ring 302 is assembled from two identical semi-ring bodies; the partition outer ring 301 is coaxially sleeved outside the partition inner ring 302 and forms an annular steam channel I between the partition inner ring 302, and the plurality of partition stationary blades 303 are evenly spaced and distributed to the annular shaped steam channel I, and divides the annular steam channel into multiple steam channel openings I, that is, a steam channel opening I is formed between two adjacent baffle stationary blades 303; wherein, the baffle outer ring 301 and the baffle stationary blades 303 are connected by welding, and the baffle stationary blades 303 and the baffle inner ring 302 are connected by welding; the baffle stationary blades 303 are milled blades with their own circumferential bands, and the longitudinal section of the semi-ring body of the baffle inner ring 302 is L-shaped, that is, an integral annular ring is coaxially arranged on the steam inlet side of the baffle inner ring 302.

[0042] The steam seal body 2 is coaxially installed on the steam outlet side of the partition outer ring 301 of the partition body 3, and is preferably connected by welding, that is, the steam inlet side end face of the steam seal body 2 is welded to the steam outlet side end face of the partition outer ring 301 of the partition body 3, which is also used to ensure the steam seal gap between the partition body 3 and the rotor, reduce leakage loss, and improve the thermal efficiency of the whole machine.

[0043] like Figure 3As shown, the rotating ring 4 is made of chromium-molybdenum alloy steel, and includes a rotating ring outer ring 401, a rotating ring inner ring 402 and a plurality of rotating ring stationary blades 403. The rotating ring outer ring 401 is coaxially sleeved outside the rotating ring inner ring 402 and forms an annular steam channel between the rotating ring inner ring 402. The plurality of rotating ring stationary blades 403 are evenly spaced and distributed in the annular steam channel, and divide the annular steam channel into a plurality of steam channel openings II, that is, a steam channel opening II is formed between two adjacent rotating ring stationary blades 403; wherein the rotating ring outer ring 401 and the rotating ring stationary blades 403 are connected by welding, and the rotating ring stationary blades 403 and the rotating ring inner ring 402 are connected by welding, and the number of the rotating ring stationary blades 403 and the number of the steam channel openings II are the same as the number of the steam channel openings I on the partition body 3, so a single-circle window structure is formed between the partition body 3 and the rotating ring 4, and the cross-sectional area of ​​each rotating ring stationary blade 403 is equal to the flow area of ​​each steam channel opening I.

[0044] like Figure 5 As shown, the rotating ring 4 is coaxially arranged on the steam inlet side of the partition body 3, that is, the rotating ring 4 is sleeved on the annular ring on the partition inner ring 302, and the outer diameter of the rotating ring 4 is smaller than the outer diameter of the partition body 3, so there is a certain space between the outer ring surface of the rotating ring 4 and the edge of the partition body 3, and this space is used to install the cover ring 5; a rotating friction pair is formed between the rotating ring 4 and the end face of the steam inlet side of the partition body 3, that is, two annular friction belts are coaxially arranged on the end face of the steam inlet side of the partition body 3, and the friction belts are two annular protrusions Ⅰ made integrally with the partition body 3, and Stellite alloy is welded on the annular protrusion Ⅰ; the two friction belts are friction belt Ⅰ304 and friction belt Ⅱ305 respectively, and the friction belt Ⅰ304 is located on the outer ring 301 of the partition and is arranged close to the annular steam channel Ⅰ, and the friction belt Ⅱ305 is located on the inner ring 302 of the partition and is arranged close to the annular steam channel Ⅰ; as shown Figure 7As shown, two coaxial annular friction belts are also arranged on the steam outlet side end face of the rotating ring 4. The friction belts are two annular protrusions II made integrally with the rotating ring 4, and the annular protrusions II are sprayed with a Cr3C2-NiCr metal ceramic coating; the two friction belts on the rotating ring 4 are friction belt III404 and friction belt IV405, respectively, the friction belt III404 is located on the outer ring 401 of the rotating ring and is arranged close to the annular steam channel II, and the friction belt IV405 is located on the inner ring 402 of the rotating ring and is arranged close to the annular steam channel II; the friction belt I304 on the partition body 3 and the friction belt III on the rotating ring 4 404 forms a rotating friction pair I, and the friction belt II 305 on the partition body 3 and the friction belt IV 405 on the rotating ring 4 form a rotating friction pair II; the rotating friction pair I and the rotating friction pair II together form a rotating friction pair between the rotating ring 4 and the partition body 3; the rotating friction pair I and the rotating friction pair II are used to bear the front and rear pressure difference of the rotating ring 4. Except for the friction belt III 404 and the friction belt IV 405 that come into contact with the steam inlet side end face of the partition body 3, the remaining part of the rotating ring 4 does not come into contact with the steam inlet side end face of the rotating ring 4. Therefore, the rotating friction pair I and the rotating friction pair II also have a pressure supporting effect on the rotating ring 4.

[0045] like Figure 3 As shown, the cover ring 5 is a chromium-molybdenum alloy steel forging, including an upper cover ring 501 and a lower cover ring 502. The longitudinal sections of the upper cover ring 501 and the lower cover ring 502 are both L-shaped, and the structures of the two are basically the same, except that a guide notch 503 is opened on one side of the lower cover ring 502; the cover ring 5 covers the outside of the rotating ring 4, specifically, the upper cover ring 501 completely covers the rotating ring outer ring 401 of the upper half of the rotating ring 4, including the rotating ring outer ring 401 on the steam inlet side end face and outer annular surface; the lower half cover ring 502 completely covers the rotating ring outer ring 401 on the lower half of the rotating ring 4, including the steam inlet side end face and outer annular surface of the rotating ring outer ring 401; a rotating handle 406 is provided on the outer annular surface of the rotating ring outer ring 401 on the lower half of the rotating ring 4, and the rotating handle 406 is inserted into the guide notch 503 on the lower half cover ring 502 and can move along the arc extension direction of the guide notch 503.

[0046] The cover ring 5 is fixedly mounted on the steam inlet side end face of the partition body 3, that is, the upper half cover ring 501 and the lower half cover ring 502 are fixed to the edge of the partition outer ring 301 by bolts and remain stationary.

[0047] like Figure 8 and Fig. 9As shown, two symmetrical pressure balance chambers 6 are formed between the cover ring 5, the rotating ring 4 and the partition body 3; that is, a pressure balance chamber 6 located at the top is formed between the upper half of the cover ring 501, the upper half of the rotating ring 4 and the upper half of the partition body 3, and a pressure balance chamber 6 located at the bottom is formed between the lower half of the cover ring 502, the lower half of the rotating ring 4 and the lower half of the partition body 3. The structure of the pressure balance chamber 6 located at the top is the same as that of the pressure balance chamber 6 located at the bottom, so only the pressure balance chamber 6 located at the top is used as an example for explanation. The pressure balance chamber 6 is specifically formed by the following design:

[0048] The upper half cover ring 501 and one side of the rotating ring 4 form a sealing cavity I601, that is, the side of the upper half cover ring 501 facing the rotating ring 4 is recessed inwardly, and two elastic sealing strips 7 are respectively provided on the inner side wall of the upper half cover ring 501 facing the rotating ring outer ring 401, and the two elastic sealing strips 7 are coaxially arranged radially and are respectively located above and below the recessed part of the inner wall of the upper half cover ring 501; the elastic sealing strip 7 generates an extrusion force between the upper half cover ring 501 and the rotating ring outer ring 401 to achieve the purpose of cavity sealing; the sealing cavity I601 is an arc-shaped chamber. The steam outlet side of the rotating ring outer ring 401 and the steam inlet side of the partition outer ring 301 form a sealed chamber II 602 under the setting of the rotating friction pair, that is, since the partition body 3 and the cover ring 5 are in a stationary state, and the rotating ring 4 can rotate relative to the cover ring 5 and the partition body 3, there is a certain gap between the rotating ring 4 and the upper half of the cover ring 501, and there is a certain gap between the rotating ring 4 and the partition body 3. Therefore, a sealed chamber II 602 is formed between the rotating ring outer ring 401 and the partition outer ring 301, between the elastic sealing strip 7 at the top and the rotating friction pair I; the sealed chamber II 602 is also an arc-shaped chamber. The upper half cover ring 501 is evenly provided with a plurality of balancing channels I504 along its arc-shaped extension direction, the partition outer ring 301 is evenly provided with a plurality of radially arranged balancing channels II306 along its arc-shaped extension direction, and the balancing channel II306 is communicated with the steam port I on the partition body 3; the partition outer ring 301 is evenly provided with a plurality of axially arranged balancing channels III307 along its arc-shaped extension direction, and the number of the balancing channels II306 is twice the number of the balancing channels III307; the balancing channel II306 on the partition outer ring 301 is evenly divided into two parts, one part of the balancing channel II306 is communicated with the sealing chamber I601 through a plurality of balancing channels I504, that is, one end of the balancing channel II306 is communicated with one end of the balancing channel I504, and the other end of the balancing channel I504 is communicated with the sealing chamber I601. The other part of the balancing channel II 306 is communicated with the sealed chamber II 602 through several balancing channels III 307, that is, the middle section of the balancing channel II 306 is communicated with one end of the balancing channel III 307, and the other end of the balancing channel III 307 is communicated with the sealed chamber II 602. Since the two parts of the balancing channel II 306 are communicated with the steam port I on the partition body 3, the purpose of the sealed chamber I 601 and the sealed chamber II 602 being communicated is achieved; that is, the sealed chamber I 601 and the sealed chamber II 602 are communicated through several balancing channels I 504, one part of the balancing channel II 306, the steam port I on the partition body 3, the other part of the balancing channel II 306 and several balancing channels III 307 in sequence, that is, the two parts of the balancing channel II 306 are communicated through the steam port I, so that the sealed chamber I 601 and the sealed chamber II 602 are communicated.

[0049] The present embodiment adopts a single-circle window structure, and the partition body 3 is changed from the original casting structure to a welding structure, which can reduce the residual stress in the partition body 3; at the same time, the partition body 3, the rotating ring 4 and the cover ring 5 are made of chromium-molybdenum alloy steel, which is convenient for machining and welding, and the chromium-molybdenum alloy steel has a temperature resistance of up to 500°C. The present application can operate safely for a long time at 400°C, and can avoid the problem of stuck rotation of the partition body 3, the rotating ring 4 and the cover ring 5 due to thermal deformation.

[0050] In this embodiment, a rotating friction pair is formed between the rotating ring 4 and the partition body 3, which is used to bear the front and rear pressure difference of the rotating ring 4. The friction surface of the friction pair adopts advanced thermal spraying wear-resistant coating technology, that is, NiCr-Cr2C3 coating is sprayed on the steam outlet side of the rotating ring 4, and Stellite alloy is welded on the side of the partition body 3. This makes the new friction pair have higher high-temperature hardness, excellent high-temperature wear resistance, corrosion resistance, oxidation resistance and higher bonding strength, and can be widely used in parts working under high-temperature abrasive wear, corrosive wear and erosive wear conditions.

[0051] In this embodiment, by setting a pressure balance chamber 6, that is, by setting a communicating sealing chamber I 601 and sealing chamber II 602 on the steam inlet side and the steam outlet side of the rotating ring 4, the pressure on both sides of the rotating ring 4 is kept balanced, and compared with the previous design form, the positive pressure of the rotating ring 4 on the partition body 3 can be reduced, thereby reducing the friction of the rotating friction pair between the rotating ring 4 and the partition body 3, and further reducing the opening torque of the rotating ring 4. At the same time, due to the symmetrical arrangement of the two pressure balance chambers 6, the relative balance channels in the two pressure balance chambers 6 are also in a symmetrical arrangement. The reasonable and symmetrical arrangement of the position and structural size of the balance channel in the pressure balance chamber 6 can not only meet the balance connection function, but also will not cause deformation and warping of the rotating ring 4 due to uneven axial force caused by the unreasonable arrangement of the balance channel. At the same time, the weakening of the strength of the rotating partition by the balance channel should be reduced, thereby ensuring the safe operation requirements of the rotating partition. In addition, an elastic sealing strip 7 is arranged between the cover ring 5 and the rotating ring 4. On the premise of ensuring the sealing effect of the sealing chamber I 601 and the sealing chamber II 602, there is still sufficient yield capacity between the rotating ring 4 and the cover ring 5 to avoid the rotating ring 4 and the cover ring 5 from rubbing and deforming, which would cause the rotating partition to get stuck.

[0052] In this embodiment, a sufficiently large oil motor is used to drive the rotation of the rotating ring 4 to ensure the surplus of torque, so that the rotating baffle can move freely, safely and reliably; the new rotating baffle can be used for the extraction regulation needs of large-capacity and high-extraction parameter steam turbines.

[0053] The working process of the present invention is further described below to further demonstrate the working principle and advantages of the present invention:

[0054] When the rotating baffle of the present application is installed, the baffle body 3 is fixed on the baffle sleeve in the turbine, and the rotating ring 4 is sleeved on the baffle body 3. When the steam intake of the turbine needs to be adjusted, the rotating ring 4 is connected to the oil motor through a connecting rod. The oil motor reciprocates up and down, driving the rotating ring 4 to rotate at a small angle with the central axis of the baffle body 3 as the axis, that is, a rotating pair is formed between the rotating ring 4 and the baffle body 3. During this process, each rotating ring static blade 403 on the rotating ring 4 and each steam channel opening I on the baffle body 3 are relatively misaligned, thereby changing the flow area of ​​the rotating baffle steam intake (when the steam channel opening II on the rotating ring overlaps with the steam channel opening I on the baffle body, the flow area of ​​the rotating baffle is the largest, and the steam intake of the turbine is the largest; when the rotating ring static blade 403 completely overlaps with the steam channel opening I on the baffle body, the flow area of ​​the rotating baffle is the smallest, and the steam intake of the turbine is the smallest); thereby achieving steam extraction regulation. By reasonably selecting the cold installation gap between the rotating ring 4 and the partition body 3, the partition rotating pair still has enough movement gap under high temperature and high pressure environment. Since there is a rotating friction pair between the partition body 3 and the rotating ring 4, when the steam turbine is fed with steam, the high temperature and high pressure steam generates a certain pressure on the rotating ring 4, so the rotating ring 4 exerts a certain positive pressure on the steam inlet side end face of the partition body 3; when the flow area of ​​the rotating partition remains unchanged, since there is a pressure balance chamber 6 between the rotating ring 4, the partition body 3 and the cover ring 5, even in the process of the rotating ring 4 rotating, the positive pressure of the rotating ring 4 on the partition body 3 can be kept constant, thereby ensuring that the friction force of the rotating friction pair between the rotating ring 4 and the partition body 3 remains unchanged, and ensuring that the opening torque of the rotating ring 4 remains unchanged; at the same time, the rotating ring 4 is evenly stressed under the action of the pressure balance chamber 6 and will not be deformed.

[0055] This embodiment conducts finite element and friction pair simulation experiments, such as Figures 10 to 13 As shown, the strength and stiffness of the optimized rotating partition meet the use requirements, and the rotating ring deforms evenly without obvious warping.

[0056] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A rotating baffle suitable for supercritical industrial steam extraction, characterized by: It comprises a steam seal ring (1), a steam seal body (2), a partition body (3), a rotating ring (4) and a cover ring (5); the steam seal ring (1), the steam seal body (2), the partition body (3), the rotating ring (4) and the cover ring (5) are all annular structures; the steam seal ring (1) is mounted on the inner ring surface of the partition body (3); the steam seal body (2) is coaxially mounted on the steam outlet side of the partition body (3); the rotating ring (4) is coaxially mounted on the steam inlet side of the partition body (3) and generates positive pressure on the partition body (3); and a rotating friction pair is formed between the rotating ring (4) and the partition body (3); the cover ring (5) is covered on the rotating ring (4) and coaxially mounted on the partition body (3); two upper and lower symmetrical pressure balance chambers (6) are formed between the cover ring (5), the rotating ring (4) and the partition body (3); the two pressure balance chambers (6) ensure that the positive pressure generated by the rotating ring (4) on the partition body (3) is constant; The partition body (3) comprises a partition outer ring (301), a partition inner ring (302) and a plurality of partition stationary blades (303); the partition outer ring (301) is coaxially sleeved outside the partition inner ring (302) and forms an annular steam passage I with the partition inner ring (302); the plurality of partition stationary blades (303) are evenly distributed in the annular steam passage I and divide the annular steam passage into a plurality of steam passage openings I; the rotating ring (4) comprises a rotating ring outer ring (401), a rotating ring inner ring (402) and a plurality of rotating ring stationary blades (303); The rotating ring outer ring (401) is coaxially sleeved outside the rotating ring inner ring (402) and forms an annular steam passage II with the rotating ring inner ring (402); the plurality of rotating ring stationary blades (403) are evenly distributed in the annular steam passage II and divide the annular steam passage II into a plurality of steam passage openings II; the number of the rotating ring stationary blades (403) is the same as the number of steam passage openings I on the partition body (3), and the cross-sectional area of ​​each rotating ring stationary blade (403) is equal to the flow area of ​​each steam passage opening I; The cover ring (5) comprises an upper cover ring (501) and a lower cover ring (502), the upper cover ring (501) and the lower cover ring (502) being arranged opposite to each other vertically, and a guide notch (503) is provided on one side of the lower cover ring (502); a rotating handle (406) is provided on the outer ring surface of the rotating ring (4), the rotating handle (406) is inserted into the guide notch (503) on the lower cover ring (502), and can move along the arc extension direction of the guide notch (503); Two annular friction belts are coaxially arranged on the steam inlet side end surface of the partition body (3), and the two friction belts are friction belt I (304) and friction belt II (305). Two coaxial annular friction belts are arranged on the steam outlet side end surface of the rotating ring (4), and the two friction belts on the rotating ring (4) are friction belt III (404) and friction belt IV (405). The friction belt I (304) on the partition body (3) and the friction belt III (404) on the rotating ring (4) form a rotating friction pair I, and the friction belt II (305) on the partition body (3) and the friction belt IV (405) on the rotating ring (4) form a rotating friction pair II. The rotating friction pair I and the rotating friction pair II together form a rotating friction pair between the rotating ring (4) and the partition body (3).

2. A rotary baffle suitable for supercritical industrial steam extraction according to claim 1, characterized in that: The friction belt I (304) is located on the outer ring (301) of the partition plate and is arranged close to the annular steam channel I, and the friction belt II (305) is located on the inner ring (302) of the partition plate and is arranged close to the annular steam channel I; The friction belt III (404) is located on the outer ring (401) of the rotating ring and is arranged close to the annular steam channel II, and the friction belt IV (405) is located on the inner ring (402) of the rotating ring and is arranged close to the annular steam channel II.

3. A rotary baffle suitable for supercritical industrial steam extraction according to claim 2, characterized in that: The friction belt I (304) and the friction belt II (305) are two annular protrusions I integrally formed with the partition body (3), and the two annular protrusions I are respectively welded with Stellite alloy; The friction belt III (404) and the friction belt IV (405) are two annular protrusions II integrally made with the rotating ring (4), and the two annular protrusions II are sprayed with a Cr3C2-NiCr metal ceramic coating.

4. A rotary baffle for supercritical industrial steam extraction according to claim 1, characterized in that: The upper half of the cover ring (501), the upper half of the rotating ring (4) and the upper half of the partition body (3) form a pressure balance chamber (6), and the lower half of the cover ring (502), the lower half of the rotating ring (4) and the lower half of the partition body (3) form a pressure balance chamber (6). The two pressure balance chambers (6) have the same structure, so one of the pressure balance chambers (6) is used for description; The upper half cover ring (501) and the steam inlet side of the rotating ring outer ring (401) form a sealed chamber I (601), and the steam outlet side of the rotating ring outer ring (401) and the steam inlet side of the partition outer ring (301) form a sealed chamber II (602); a plurality of balancing channels I (504) are evenly opened on the upper half cover ring (501) along its arc-shaped extension direction, and a plurality of radially arranged balancing channels II (306) are evenly opened on the partition outer ring (301) along its arc-shaped extension direction, and the balancing channels II (306) are communicated with the steam channel opening I on the partition body (3); 1) A plurality of axially arranged balancing channels III (307) are uniformly opened along the arc-shaped extension direction, and the number of the balancing channels II (306) is twice the number of the balancing channels III (307); the balancing channel II (306) on the outer ring (301) of the partition plate is evenly divided into two parts, one part of the balancing channel II (306) is communicated with the sealing chamber I (601) through a plurality of balancing channels I (504), and the other part of the balancing channel II (306) is communicated with the sealing chamber II (602) through a plurality of balancing channels III (307), so the sealing chamber I (601) is communicated with the sealing chamber II (602).

5. A rotary baffle suitable for supercritical industrial steam extraction according to claim 4, characterized in that: The upper half cover ring (501) is recessed inwardly on one side facing the rotating ring (4), and two elastic sealing strips (7) are respectively provided on the inner side wall of the upper half cover ring (501) facing the rotating ring outer ring (401), the two elastic sealing strips (7) being coaxially arranged radially and respectively located above and below the recessed portion of the inner wall of the upper half cover ring (501); the elastic sealing strips (7) generate a squeezing force between the upper half cover ring (501) and the rotating ring outer ring (401).

6. The rotary baffle for supercritical industrial steam extraction according to claim 1, characterized in that: The partition plate outer ring (301) and the partition plate stationary blades (303) are connected by welding, and the partition plate stationary blades (303) and the partition plate inner ring (302) are connected by welding.

7. The rotary baffle for supercritical industrial steam extraction according to claim 1, characterized in that: The materials of the partition body (3), the rotating ring (4) and the cover ring (5) are all chromium-molybdenum alloy steel.

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