High-pressure main steam regulating valve of steam turbine

Abstract

The utility model belongs to the technical field of steam turbines, and particularly relates to a steam turbine high-pressure main steam regulating valve which comprises a main steam valve and a regulating steam valve, a first flange is arranged on the main steam valve, a second flange is arranged on the regulating steam valve, the main steam valve comprises an inner-layer valve casing and an outer-layer valve casing, and a cooling interlayer is arranged between the inner-layer valve casing and the outer-layer valve casing. A propelling assembly is arranged in the cooling interlayer, the outer-layer valve shell comprises a first metal rod, a second metal rod and a connecting rod, and the propelling assembly is specifically composed of a main shaft, fan blades, a connecting end and a bearing. The structural strength and the bearing performance of the outer-layer valve shell are guaranteed through the outer-layer valve shell, the first metal rod, the second metal rod and the connecting rod, the cost cannot be increased, power is provided for conveying cooling steam in the cooling interlayer through the cooling interlayer, the propelling assembly, the main shaft, the fan blades, the connecting end and the bearing, the situation that the flowability of the cooling steam is reduced is avoided, and the service life of the cooling steam is prolonged. And the conveying fluidity of the cooling steam in the cooling interlayer is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbines, in particular to a high-pressure main steam regulating valve for a steam turbine. Background Technique

[0002] The high-pressure main steam regulating valve of a steam turbine is a valve used to regulate the entry of high-pressure main steam of the steam turbine into the steam turbine. Its function is to regulate the flow rate of the main steam under different working conditions to maintain the stable operation of the steam turbine. These regulating valves usually have high-temperature and high-pressure main steam flowing through them. The high-pressure main steam regulating valve of a steam turbine plays a crucial role in the operation process of the steam turbine and has an important impact on the performance and stability of the steam turbine.

[0003] The prior art has the following deficiencies: In the prior art, the application number is 201810694844.9, which proposes a high-pressure main steam regulating valve group for a steam turbine. Both the main steam valve and the regulating valve adopt a structural design of connecting and sealing with a double-layer shell and separating the interlayer. The inner valve shell uses high-cost materials with a relatively high temperature, and the outer valve shell uses conventional metal materials with a lower price; the high-pressure steam inlet pipe connection is combined with the outer shell of the main steam valve, and the outer shell of the main steam valve and the outer shell of the regulating valve are connected by threads. The high-pressure steam inlet pipe connection is connected with the inner shell of the main steam valve, and the inner shell of the main steam valve and the inner shell of the regulating valve adopt a "C"-type seal; the interlayers between the inner and outer shells of the main steam valve and the interlayers between the inner and outer shells of the regulating valve are both divided into two different relatively (inner shell) low-temperature steam chambers to form a specific temperature field; and the interlayers between the inner and outer shells of the main steam valve and the interlayers between the inner and outer shells of the regulating valve are communicated.

[0004] When the above equipment is used, it adopts a structural design of connecting and sealing with a double-layer shell and separating the interlayer. The inner valve shell uses high-cost materials with a relatively high temperature, and the outer valve shell uses conventional metal materials with a lower price to form a relatively low-temperature steam chamber, forming a pressure difference flow and continuously exchanging heat with the inner valve shell to achieve a cooling effect. Although using conventional metal materials for the outer layer can save costs, the external structural strength of the overall main steam regulating valve is reduced, the load-bearing performance decreases, and it is easily damaged by external forces. Moreover, the overall fluidity of the cooling steam introduced into the cooling interlayer is not further driven when entering the cooling interlayer, resulting in a gradual decrease in the fluidity of the cooling steam. The fluidity of the cooling steam in the cooling interlayer can be further improved. Content of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model provides a high-pressure main steam regulating valve for a steam turbine to solve the problems raised in the above background technique.

[0006] To achieve the above object, the present utility model provides the following technical solutions: A high-pressure main steam regulating valve for a steam turbine, comprising a main steam valve and a regulating steam valve. A first flange is provided on the main steam valve, and a second flange is provided on the regulating steam valve. The main steam valve includes an inner valve housing and an outer valve housing. A cooling interlayer is provided between the inner valve housing and the outer valve housing. A propulsion assembly is provided in the cooling interlayer, and a sandwich inlet is provided on the outside of the main steam valve.

[0007] The outer valve housing includes a first metal rod, a second metal rod, and a connecting rod. A connecting rod is provided between the first metal rod and the second metal rod.

[0008] The propulsion assembly is specifically composed of a main shaft, fan blades, connecting ends, and bearings. Fan blades are provided on the outside of the main shaft. Connecting ends are provided at both ends of the main shaft, and bearings are provided on the connecting ends.

[0009] As a preferred technical solution of the present utility model: The first flange and the second flange are fixedly and sealingly connected by bolts, and the connecting end and the main shaft are integrally formed.

[0010] As a preferred technical solution of the present utility model: The inner ring of the bearing is fixedly sleeved on the connecting end. The outer rings of the bearings at both ends of the main shaft are respectively fixedly embedded on the outside of the inner valve housing and the inner wall of the outer valve housing. The main shaft is entirely located in the cooling interlayer.

[0011] As a preferred technical solution of the present utility model: The fan blades are fixedly installed on the outside of the main shaft. Four groups of fan blades are fixed on each main shaft. There are several groups of the propulsion assemblies, and their own structures and installation structures are the same.

[0012] As a preferred technical solution of the present utility model: A sandwich outlet is provided at the outer end of the main steam valve corresponding to the sandwich inlet, and the sandwich inlet communicates with the cooling interlayer.

[0013] As a preferred technical solution of the present utility model: The regulating steam valve is provided with the same inner valve housing, outer valve housing, cooling interlayer, propulsion assembly, and sandwich inlet. The installation method of the propulsion assembly in the regulating steam valve is the same as that of the propulsion assembly in the main steam valve.

[0014] As a preferred technical solution of the present utility model: The first metal rods are fixedly embedded in the outer valve housing and there are several groups. The second metal rods are fixedly embedded in the outer valve housing and are located below the first metal rods. Each two adjacent first metal rods and one group of second metal rods are fixed by a connecting rod. The first metal rods and the second metal rods are both cast from steel.

[0015] Compared with the prior art, the present utility model provides a high-pressure main steam regulating valve for a steam turbine, having the following beneficial effects:

[0016] 1. The high-pressure main steam regulating valve of a steam turbine, by setting an outer valve housing, a first metal rod, a second metal rod, and a connecting rod, when the outer valve housing is affected by an external force, the first metal rod can directly enhance the mechanical strength of the outer valve housing, and when two adjacent first metal rods are stressed, they will also be transmitted to a group of second metal rods through the connecting rod. A triangular stable structure is formed between the two groups of first metal rods and a group of second metal rods, ensuring the structural strength and load-bearing performance of the outer valve housing without increasing the cost.

[0017] 2. The high-pressure main steam regulating valve of a steam turbine, by setting a cooling interlayer, a propulsion assembly, a main shaft, fan blades, a connection end, and bearings, the heat of the steam is in the main steam valve and the regulating steam valve, and at the same time, part of the heat is transferred to the cooling interlayer. The cooling steam enters the cooling interlayer through the interlayer inlet, and during the transportation process, it pushes the propulsion assembly to rotate continuously, providing power for the transportation of the cooling steam in the cooling interlayer, avoiding the reduction of the fluidity of the cooling steam, and ensuring the transportation fluidity of the cooling steam in the cooling interlayer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall external structure of the present utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the main steam valve of the present utility model;

[0020] Figure 3 It is the present utility model Figure 2 An enlarged schematic diagram of part A;

[0021] Figure 4 It is a schematic diagram of the structure of the propulsion assembly of the present utility model;

[0022] Figure 5 It is a schematic diagram of the structure of the outer valve housing of the present utility model.

[0023] In the figure: 1. Main steam valve; 2. Regulating steam valve; 3. First flange; 4. Second flange; 5. Inner valve housing; 6. Outer valve housing; 601. First metal rod; 602. Second metal rod; 603. Connecting rod; 7. Cooling interlayer; 8. Propulsion assembly; 801. Main shaft; 802. Fan blades; 803. Connection end; 804. Bearing; 9. Interlayer inlet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] Please refer to Figures 1-5 , in this embodiment: A high-pressure main steam regulating valve for a steam turbine includes a main steam valve 1 and a regulating steam valve 2. A first flange 3 is provided on the main steam valve 1, and a second flange 4 is provided on the regulating steam valve 2. The main steam valve 1 includes an inner valve housing 5 and an outer valve housing 6. A cooling sandwich layer 7 is provided between the inner valve housing 5 and the outer valve housing 6. A propulsion assembly 8 is provided in the cooling sandwich layer 7, and a sandwich inlet 9 is provided on the outside of the main steam valve 1;

[0026] The outer valve housing 6 includes a first metal rod 601, a second metal rod 602, and a connecting rod 603. A connecting rod 603 is provided between the first metal rod 601 and the second metal rod 602. The first metal rod 601 and the second metal rod 602 can be connected through the connecting rod 603 to form a triangular stable structure;

[0027] The propulsion assembly 8 is specifically composed of a main shaft 801, fan blades 802, connection ends 803, and bearings 804. Fan blades 802 are provided on the outside of the main shaft 801. Connection ends 803 are provided at both ends of the main shaft 801, and bearings 804 are provided on the connection ends 803. The main shaft 801 can provide an installation environment for the fan blades 802.

[0028] In this embodiment, the first flange 3 and the second flange 4 are fixedly and sealedly connected by bolts. The connection end 803 and the main shaft 801 are integrally formed. The main steam valve 1 and the regulating steam valve 2 can be conveniently connected through the first flange 3 and the second flange 4;

[0029] In this embodiment, the inner ring of the bearing 804 is fixedly sleeved on the connection end 803. The outer rings of the bearings 804 at both ends of the main shaft 801 are respectively fixedly embedded on the outside of the inner valve housing 5 and the inner wall of the outer valve housing 6. The main shaft 801 is entirely located in the cooling sandwich layer 7. The installation of the propulsion assembly 8 can be facilitated through the connection end 803 and the bearings 804, and flexible rotation can be ensured;

[0030] In this embodiment, the fan blades 802 are fixedly installed on the outside of the main shaft 801. Four groups of fan blades 802 are fixed on each main shaft 801. There are several groups of propulsion assemblies 8, and their own structures and installation structures are the same. The cooling steam conveyed in the cooling sandwich layer 7 can be propelled through the fan blades 802;

[0031] In this embodiment, a sandwich outlet is provided at the outer tail end of the main steam valve 1 corresponding to the sandwich inlet 9. The sandwich inlet 9 communicates with the cooling sandwich 7, and cooling steam can be transmitted through the cooling sandwich 7 to cool the main steam valve 1 and the governing valve 2.

[0032] In this embodiment, the governing valve 2 is provided with the same inner valve housing 5, outer valve housing 6, cooling sandwich 7, propulsion assembly 8, and sandwich inlet 9. The installation method of the propulsion assembly 8 in the governing valve 2 is the same as that of the propulsion assembly 8 in the main steam valve 1. The sandwich inlet 9 facilitates the entry of external cooling steam into the cooling sandwich 7.

[0033] In this embodiment, a number of first metal rods 601 are fixedly embedded in the outer valve housing 6, and a number of second metal rods 602 are fixedly embedded in the outer valve housing 6 and are located below the first metal rods 601. Each two adjacent first metal rods 601 and a group of second metal rods 602 are fixed by a connecting rod 603. The first metal rods 601 and the second metal rods 602 are both cast from steel. A triangular stable structure can be formed between the first metal rods 601, the second metal rods 602 and the connecting rod 603 to ensure the structural strength and load-bearing performance of the outer valve housing 6.

[0034] The working principle and usage process of the present utility model: In actual use, the first flange 3 and the second flange 4 are fixedly connected to each other by bolts, so that the main steam valve 1 and the governing valve 2 are connected. Finally, the connected main steam valve 1 and governing valve 2 are installed at the corresponding positions on the steam turbine. When the steam turbine starts, steam is delivered to the steam turbine through the main steam valve 1 and the governing valve 2 for normal use of the steam turbine. During this process, the heat of the steam is in the main steam valve 1 and the governing valve 2, and at the same time, part of the heat is transferred to the cooling sandwich 7. The sandwich inlet 9 is connected to the output end of the external cooling steam. The cooling steam enters the cooling sandwich 7 and contacts the propulsion assembly 8 during the delivery process. The cooling steam pushes the fan blade 802 to drive the main shaft 801 to rotate. The cooling steam is continuously delivered, and the propulsion assembly 8 continuously rotates, which can provide power for the delivery of the cooling steam in the cooling sandwich 7, prevent the fluidity of the cooling steam from decreasing, and ensure the delivery fluidity of the cooling steam in the cooling sandwich 7. The cooling sandwich 7 in the governing valve 2 has the same structure and principle as the cooling sandwich 7 in the main steam valve 1. At the same time, when the outer valve housing 6 is affected by external forces, the first metal rod 601 can directly improve the mechanical strength of the outer valve housing 6, and when two adjacent first metal rods 601 are stressed, they will also transfer the force to a group of second metal rods 602 through the connecting rod 603. A triangular stable structure is formed between the two first metal rods 601 and a group of second metal rods 602 through the connecting rod 603 to ensure the structural strength and load-bearing performance of the outer valve housing 6 without increasing the cost at the same time.

[0035] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A steam turbine high-pressure main steam regulating valve, comprising a main steam valve (1) and a regulating steam valve (2), wherein the main steam valve (1) is provided with a first flange (3), and the regulating steam valve (2) is provided with a second flange (4), characterized in that: The main steam valve (1) comprises an inner valve shell (5) and an outer valve shell (6), a cooling interlayer (7) is arranged between the inner valve shell (5) and the outer valve shell (6), a propulsion assembly (8) is arranged in the cooling interlayer (7), and an interlayer inlet (9) is opened on the outer side of the main steam valve (1); The outer valve housing (6) comprises a first metal rod (601), a second metal rod (602) and a connecting rod (603), wherein the connecting rod (603) is arranged between the first metal rod (601) and the second metal rod (602); The propulsion assembly (8) is specifically composed of a main shaft (801), fan blades (802), a connecting end (803) and a bearing (804), wherein the fan blades (802) are arranged on the outside of the main shaft (801), the connecting ends (803) are arranged at both ends of the main shaft (801), and the bearings (804) are arranged on the connecting ends (803).

2. A steam turbine high-pressure main steam regulating valve according to claim 1, characterized in that: The first flange (3) and the second flange (4) are fixed and sealed by bolts, and the connecting end (803) and the main shaft (801) are integrally formed.

3. A steam turbine high-pressure main steam regulating valve according to claim 1, characterized in that: The inner ring of the bearing (804) is fixedly sleeved on the connecting end (803), and the outer rings of the bearings (804) at both ends of the main shaft (801) are respectively fixedly embedded in the outer side of the inner valve shell (5) and the inner wall of the outer valve shell (6), and the main shaft (801) is located as a whole in the cooling interlayer (7).

4. A steam turbine high-pressure main steam regulating valve according to claim 1, characterized in that: The fan blades (802) are fixedly mounted on the outside of the main shaft (801), and four groups of fan blades (802) are fixed on each group of the main shaft (801). There are several groups of the propulsion components (8) and their own structures and mounting structures are consistent.

5. The high-pressure main steam regulating valve for a steam turbine according to claim 1, characterized in that: The outer tail end of the main steam valve (1) is provided with an interlayer outlet corresponding to the interlayer inlet (9), and the interlayer inlet (9) is in communication with the cooling interlayer (7).

6. A steam turbine high pressure main steam regulating valve according to claim 1, characterized in that: The regulating steam valve (2) is provided with an identical inner valve shell (5), outer valve shell (6), cooling interlayer (7), propulsion assembly (8) and interlayer inlet (9); the installation method of the propulsion assembly (8) in the regulating steam valve (2) is consistent with the installation method of the propulsion assembly (8) in the main steam valve (1).

7. A steam turbine high pressure main steam regulating valve according to claim 1, characterized in that: The first metal rods (601) are fixedly embedded in the outer valve housing (6) and there are several groups of them. The second metal rods (602) are fixedly embedded in the outer valve housing (6) and are located below the first metal rods (601). Every two adjacent groups of the first metal rods (601) and one group of the second metal rods (602) are fixed by connecting rods (603). The first metal rods (601) and the second metal rods (602) are both cast from steel.

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