Barrel-shaped high-pressure inner cylinder steam seal structure

Abstract

The invention discloses a cylindrical high-pressure inner cylinder steam seal structure which is characterized in that a shrinkage fit ring is arranged outside a high-pressure inner cylinder upper half and a high-pressure inner cylinder lower half in a sleeving manner, and the high-pressure inner cylinder upper half and the high-pressure inner cylinder lower half are combined based on a horizontal split; two steam leakage grooves are respectively formed in the horizontal split surfaces of the high-pressure inner cylinder upper half and the high-pressure inner cylinder lower half; two annular grooves are formed in the end steam seal positions of the high-pressure inner cylinder upper half and the high-pressure inner cylinder lower half, and two steam seal cavities are formed respectively. Two through-flow cavities are formed in the through-flow middle positions of the high-pressure inner cylinder upper half and the high-pressure inner cylinder lower half; the steam seal cavity is communicated with the through-flow cavity through the corresponding steam leakage grooves, high-temperature and high-pressure leaked steam of the end steam seal flows back to the through-flow, and a small amount of low-temperature and low-pressure steam leaks out of the end steam seal. According to the structure disclosed by the invention, the steam leakage amount is reduced, and the heat consumption is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbines, and in particular to a cylindrical high-pressure inner cylinder steam seal structure. Background Art

[0002] Large-scale thermal power ultra-supercritical units have high parameters. The high-pressure module adopts an inner and outer cylinder structure. The high-pressure inner cylinder mostly adopts a single-flow cylindrical cylinder structure. As a result, there is steam leakage at the end of the high-pressure inner cylinder into the inner and outer cylinder interlayer. Since the high-parameter main steam entering the inner cylinder directly enters the interlayer through the steam seal ring at the end of the inner cylinder, the amount of steam entering the interlayer is relatively large and the temperature is also relatively high. A large amount of high-temperature steam leakage increases the heat consumption of the unit and also causes the temperature of the outer cylinder to rise, affecting the service life of the outer cylinder and the flange sealing performance. At the same time, the high-temperature steam leakage of the inner cylinder also enters the shaft seal mother pipe through the leakage of the front shaft seal of the high-pressure outer cylinder, which increases the temperature of the shaft seal mother pipe, affects the material selection of the shaft seal mother pipe, and requires more cooling water. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a cylindrical high-pressure inner cylinder steam seal structure to reduce the shaft seal leakage at the end of the cylindrical high-pressure inner cylinder and reduce the shaft seal leakage steam temperature entering the outer cylinder.

[0004] The present invention provides a cylindrical high-pressure inner cylinder steam seal structure, and the specific technical scheme is as follows:

[0005] It includes the upper half of the high-pressure inner cylinder, the lower half of the high-pressure inner cylinder and the red sleeve ring;

[0006] The red sleeve ring is sleeved on the outside of the upper half of the high-pressure inner cylinder and the lower half of the high-pressure inner cylinder, and the upper half of the high-pressure inner cylinder and the lower half of the high-pressure inner cylinder are assembled based on the horizontal middle dividing plane;

[0007] The upper half of the high-pressure inner cylinder and the lower half of the high-pressure inner cylinder are respectively provided with two steam leakage grooves on the horizontal center plane;

[0008] The upper half of the high-pressure inner cylinder and the lower half of the high-pressure inner cylinder are provided with two annular grooves at the end steam seals, respectively forming two steam seal chambers;

[0009] The other end of the high-pressure inner cylinder upper half and the high-pressure inner cylinder lower half at the opposite end steam seal is provided with a flow chamber on one side facing the horizontal center plane, and the flow chamber includes a first flow chamber and a second flow chamber;

[0010] The steam seal chamber is communicated with the flow chamber through the corresponding steam leakage groove.

[0011] Furthermore, the annular groove at one end of the upper half of the high-pressure inner cylinder away from the steam seal constitutes a first steam seal chamber, and the annular groove at one end of the lower half of the high-pressure inner cylinder close to the steam seal constitutes a second steam seal chamber, the first steam seal chamber is connected to the second flow chamber, and the second steam seal chamber is connected to the first flow chamber.

[0012] Furthermore, the first flow chamber and the second flow chamber are arranged front and back based on the axial direction of the high-pressure inner cylinder.

[0013] Furthermore, the steam leakage groove forms two relative half-groove bodies on the upper half of the high-pressure inner cylinder and the lower half of the high-pressure inner cylinder, and the half-groove bodies are correspondingly arranged based on the horizontal center dividing surface. After the red ring connects the upper half of the high-pressure inner cylinder and the lower half of the high-pressure inner cylinder, the two half-groove bodies form the steam leakage groove.

[0014] Furthermore, a plurality of steam sealing rings are provided at the end steam seals of the upper half of the high-pressure inner cylinder and the lower half of the high-pressure inner cylinder, and the annular grooves are provided at the front and rear of the steam sealing rings along the axial direction of the high-pressure inner cylinder.

[0015] Furthermore, the steam inlet chamber formed by the upper half of the high-pressure inner cylinder and the lower half of the high-pressure inner cylinder is a tapered channel structure.

[0016] The beneficial effects of the present invention are as follows:

[0017] The steam inlet chamber of the high-pressure inner cylinder structure of the present invention adopts a tapered channel structure and is sealed by a red sleeve ring. Bolts can be set only on the center dividing surface of the steam inlet chamber. Two steam leakage grooves are processed through the larger space of the horizontal center dividing surface to connect the middle flow chamber, and the inner cylinder end steam seal chamber is connected to the rear flow. The main steam leakage is introduced into the rear flow, and then the partially worked steam in the flow is drained into the end steam seal and then leaked into the inner and outer interlayers, thereby achieving the effect of reducing the steam leakage amount and lowering the temperature of the shaft seal leakage steam entering the outer cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the cross-sectional structure of the high-pressure inner cylinder of the present invention.

[0019] Figure 2 It is a schematic diagram of the side structure of the high-pressure inner cylinder of the present invention.

[0020] Explanation of the reference numerals: 1-red ring, 2-upper half of the high-pressure inner cylinder, 3-lower half of the high-pressure inner cylinder, 4-annular groove, 5-steam leakage groove, 6-first steam seal chamber, 7-second steam seal chamber, 8-first flow chamber, 9-second flow chamber. DETAILED DESCRIPTION

[0021] The following description clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the invention product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" 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 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.

[0024] Example 1

[0025] Embodiment 1 of the present invention discloses a cylindrical high-pressure inner cylinder steam seal structure, such as Figure 1 As shown, the specific structure is as follows:

[0026] It includes a high-pressure inner cylinder upper half 2, a high-pressure inner cylinder lower half 3 and a red sleeve ring 1;

[0027] The red sleeve ring 1 is sleeved on the outside of the high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3, and the high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3 are assembled based on the horizontal center dividing plane;

[0028] The high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3 are combined through the red sleeve ring 1 to form a steam inlet chamber, and the steam inlet chamber is a tapered channel structure.

[0029] The high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3 are respectively provided with two steam leakage grooves 5 on the horizontal mid-section plane;

[0030] Specifically, the depth of the steam leakage groove 5 is adjusted and designed according to actual needs, and is not specifically limited here.

[0031] The high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3 are provided with two annular grooves 4 at the end steam seals, respectively forming two steam seal chambers;

[0032] Specifically, the steam sealing chamber and the position of the steam sealing chamber are adjusted and designed according to actual needs, and are not specifically limited here.

[0033] The steam leakage amount is optimally distributed by adjusting the positions of the first steam sealing chamber 6 and the second steam sealing chamber 7 and the depth of the steam leakage groove, thereby achieving the purpose of reducing heat consumption and reducing steam leakage.

[0034] As a preferred embodiment, the annular groove 4 at one end of the high-pressure inner cylinder upper half 2 away from the steam seal constitutes a first steam seal chamber 6, and the annular groove 4 at one end of the high-pressure inner cylinder lower half 3 close to the steam seal constitutes a second steam seal chamber 7, the first steam seal chamber 6 is connected to the second flow chamber 9, and the second steam seal chamber 7 is connected to the first flow chamber 8.

[0035] The high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3 are provided with two flow chambers in the middle of the flow; specifically, the high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3 are provided with flow chambers at the other end of the steam seal at the opposite end, facing the side of the horizontal center plane, and the flow chambers include a first flow chamber and a second flow chamber;

[0036] As a preferred embodiment, the first flow chamber 8 and the second flow chamber 9 are arranged front and back in the axial direction of the high-pressure inner cylinder.

[0037] Specifically, the first flow chamber 8 utilizes a high-pressure steam inlet ring chamber, and the second flow chamber 9 utilizes a zero-pressure steam extraction chamber or a separate chamber is provided.

[0038] The steam seal chamber is connected to the flow chamber through the corresponding steam leakage groove 5. Specifically, the steam leakage groove 5 is arranged to avoid the bolt holes on the flange at the high-pressure inner cylinder steam inlet chamber and the air intake chamber.

[0039] Based on the above structure, during normal operation, the pressure of the high-pressure inner cylinder steam inlet chamber>the pressure of the first flow chamber 8>the pressure of the second flow chamber 9, and the end steam seal leakage of the high-pressure inner cylinder steam inlet chamber enters the second flow chamber 9 through the first steam seal chamber 6. The first flow chamber 8 is connected to the second steam seal chamber 7. Since the pressure of the first flow chamber 8 is greater than the pressure of the second flow chamber 9 and also greater than the pressure of the first steam seal chamber 6, the leakage steam of the second steam seal chamber 7 flows to both sides, one way enters the first steam seal chamber 6 and enters the second flow chamber 9 along the steam leakage channel, and the other way enters the inner and outer cylinder interlayer. The steam in the first flow chamber 8 has done work, and the temperature and pressure have been reduced. When it leaks into the cylinder interlayer again, the temperature will be lower than the temperature of the main steam directly leaking into the outer cylinder interlayer.

[0040] Example 2

[0041] Embodiment 2 of the present invention discloses a cylindrical high-pressure inner cylinder steam seal structure, such as Figure 1 As shown, the specific structure is as follows:

[0042] It includes a high-pressure inner cylinder upper half 2, a high-pressure inner cylinder lower half 3 and a red sleeve ring 1;

[0043] The red sleeve ring 1 is sleeved on the outside of the high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3, and the high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3 are assembled based on the horizontal center dividing plane;

[0044] The high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3 are combined through the red sleeve ring 1 to form a steam inlet chamber, and the steam inlet chamber is a tapered channel structure.

[0045] The high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3 are respectively provided with two steam leakage grooves 5 on the horizontal mid-section plane;

[0046] like Figure 2 As shown, as a preferred embodiment, the steam leakage groove 5 forms two opposite half-grooves on the high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3, and the half-grooves are arranged correspondingly based on the horizontal center dividing surface. After the red ring 1 combines the high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3, the two half-grooves form the steam leakage groove 5, wherein the upper and lower half-grooves are completely aligned to form a closed passage.

[0047] Specifically, the depth of the steam leakage groove 5 is adjusted and designed according to actual needs, and is not specifically limited here.

[0048] The high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3 are provided with two annular grooves 4 at the end steam seals, respectively forming two steam seal chambers;

[0049] Specifically, the steam sealing chamber and the position of the steam sealing chamber are adjusted and designed according to actual needs, and are not specifically limited here.

[0050] The steam leakage amount is optimally distributed by adjusting the positions of the first steam sealing chamber 6 and the second steam sealing chamber 7 and the depth of the steam leakage groove, thereby achieving the purpose of reducing heat consumption and reducing steam leakage.

[0051] As a preferred embodiment, the annular groove 4 at one end of the high-pressure inner cylinder upper half 2 away from the steam seal constitutes a first steam seal chamber 6, and the annular groove 4 at one end of the high-pressure inner cylinder lower half 3 close to the steam seal constitutes a second steam seal chamber 7, the first steam seal chamber 6 is connected to the second flow chamber 9, and the second steam seal chamber 7 is connected to the first flow chamber 8.

[0052] The high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3 are provided with a flow chamber at the other end of the steam seal at the opposite end, facing the side of the horizontal center plane;

[0053] As a preferred embodiment, the first flow chamber 8 and the second flow chamber 9 are arranged front and back in the axial direction of the high-pressure inner cylinder.

[0054] The steam seal chamber is connected to the flow chamber through the corresponding steam leakage groove 5. Specifically, the steam leakage groove 5 is arranged to avoid the bolt holes on the flange at the high-pressure inner cylinder steam inlet chamber and the air intake chamber.

[0055] Based on the above structure, during normal operation, the pressure of the high-pressure inner cylinder steam inlet chamber>the pressure of the first flow chamber 8>the pressure of the second flow chamber 9, and the end steam seal leakage of the high-pressure inner cylinder steam inlet chamber enters the second flow chamber 9 through the first steam seal chamber 6. The first flow chamber 8 is connected to the second steam seal chamber 7. Since the pressure of the first flow chamber 8 is greater than the pressure of the second flow chamber 9 and also greater than the pressure of the first steam seal chamber 6, the leakage steam of the second steam seal chamber 7 flows to both sides, one way enters the first steam seal chamber 6 and enters the second flow chamber 9 along the steam leakage channel, and the other way enters the inner and outer cylinder interlayer. The steam in the first flow chamber 8 has done work, and the temperature and pressure have been reduced. When it leaks into the cylinder interlayer again, the temperature will be lower than the temperature of the main steam directly leaking into the outer cylinder interlayer.

[0056] Example 3

[0057] Embodiment 3 of the present invention discloses a cylindrical high-pressure inner cylinder steam seal structure, such as Figure 1 As shown, the specific structure is as follows:

[0058] It includes a high-pressure inner cylinder upper half 2, a high-pressure inner cylinder lower half 3 and a red sleeve ring 1;

[0059] The red sleeve ring 1 is sleeved on the outside of the high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3, and the high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3 are assembled based on the horizontal center dividing plane;

[0060] The high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3 are combined through the red sleeve ring 1 to form a steam inlet chamber, and the steam inlet chamber is a tapered channel structure.

[0061] The high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3 are respectively provided with two steam leakage grooves 5 on the horizontal mid-section plane;

[0062] like Figure 2 As shown, as a preferred embodiment, the steam leakage groove 5 forms two opposite half-grooves on the high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3, and the half-grooves are arranged correspondingly based on the horizontal center dividing surface. After the red ring 1 combines the high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3, the two half-grooves form the steam leakage groove 5, wherein the upper and lower half-grooves are completely aligned to form a closed passage.

[0063] Specifically, the depth of the steam leakage groove 5 is adjusted and designed according to actual needs, and is not specifically limited here.

[0064] The high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3 are provided with two annular grooves 4 at the end steam seals, respectively forming two steam seal chambers;

[0065] Specifically, the steam sealing chamber and the position of the steam sealing chamber are adjusted and designed according to actual needs, and are not specifically limited here.

[0066] The steam leakage amount is optimally distributed by adjusting the positions of the first steam sealing chamber 6 and the second steam sealing chamber 7 and the depth of the steam leakage groove, thereby achieving the purpose of reducing heat consumption and reducing steam leakage.

[0067] Specifically, a plurality of steam sealing rings are provided at the end steam seals of the high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3, and the annular groove 4 is provided at the front and rear of the steam sealing ring along the axial direction of the high-pressure inner cylinder.

[0068] As a preferred embodiment, the annular groove 4 at one end of the high-pressure inner cylinder upper half 2 away from the steam seal constitutes a first steam seal chamber 6, and the annular groove 4 at one end of the high-pressure inner cylinder lower half 3 close to the steam seal constitutes a second steam seal chamber 7, the first steam seal chamber 6 is connected to the second flow chamber 9, and the second steam seal chamber 7 is connected to the first flow chamber 8.

[0069] The high-pressure inner cylinder upper half 2 and the high-pressure inner cylinder lower half 3 are provided with a flow chamber at the other end of the steam seal at the opposite end, facing the side of the horizontal center plane;

[0070] As a preferred embodiment, the first flow chamber 8 and the second flow chamber 9 are arranged front and back in the axial direction of the high-pressure inner cylinder.

[0071] The steam seal chamber is connected to the flow chamber through the corresponding steam leakage groove 5. Specifically, the steam leakage groove 5 is arranged to avoid the bolt holes on the flange at the high-pressure inner cylinder steam inlet chamber and the air intake chamber.

[0072] Based on the above structure, during normal operation, the pressure of the high-pressure inner cylinder steam inlet chamber>the pressure of the first flow chamber 8>the pressure of the second flow chamber 9, and the end steam seal leakage of the high-pressure inner cylinder steam inlet chamber enters the second flow chamber 9 through the first steam seal chamber 6. The first flow chamber 8 is connected to the second steam seal chamber 7. Since the pressure of the first flow chamber 8 is greater than the pressure of the second flow chamber 9 and also greater than the pressure of the first steam seal chamber 6, the leakage steam of the second steam seal chamber 7 flows to both sides, one way enters the first steam seal chamber 6 and enters the second flow chamber 9 along the steam leakage channel, and the other way enters the inner and outer cylinder interlayer. The steam in the first flow chamber 8 has done work, and the temperature and pressure have been reduced. When it leaks into the cylinder interlayer again, the temperature will be lower than the temperature of the main steam directly leaking into the outer cylinder interlayer.

[0073] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A cylindrical high-pressure inner cylinder steam seal structure, characterized in that: It includes the upper half of the high-pressure inner cylinder, the lower half of the high-pressure inner cylinder and the red sleeve ring; The red sleeve ring is sleeved on the outside of the upper half of the high-pressure inner cylinder and the lower half of the high-pressure inner cylinder, and the upper half of the high-pressure inner cylinder and the lower half of the high-pressure inner cylinder are assembled based on the horizontal middle dividing plane; The upper half of the high-pressure inner cylinder and the lower half of the high-pressure inner cylinder are respectively provided with two steam leakage grooves on the horizontal center plane; The upper half of the high-pressure inner cylinder and the lower half of the high-pressure inner cylinder are provided with two annular grooves at the end steam seals, respectively forming two steam seal chambers; The other end of the high-pressure inner cylinder upper half and the high-pressure inner cylinder lower half at the opposite end steam seal is provided with a flow chamber on one side facing the horizontal center plane, and the flow chamber includes a first flow chamber and a second flow chamber; The steam seal chamber is communicated with the flow chamber through the corresponding steam leakage groove.

2. The cylindrical high-pressure inner cylinder steam seal structure according to claim 1 is characterized in that: The annular groove at one end of the upper half of the high-pressure inner cylinder away from the steam seal constitutes a first steam seal chamber, and the annular groove at one end of the lower half of the high-pressure inner cylinder close to the steam seal constitutes a second steam seal chamber. The first steam seal chamber is connected to the second flow chamber, and the second steam seal chamber is connected to the first flow chamber.

3. The cylindrical high-pressure inner cylinder steam seal structure according to claim 2 is characterized in that: The first flow chamber and the second flow chamber are arranged front and back in the axial direction of the high-pressure inner cylinder.

4. The cylindrical high-pressure inner cylinder steam seal structure according to claim 1 is characterized in that: The steam leakage groove forms two opposite half-groove bodies on the upper half of the high-pressure inner cylinder and the lower half of the high-pressure inner cylinder, and the half-groove bodies are arranged correspondingly based on the horizontal center dividing surface. After the red ring connects the upper half of the high-pressure inner cylinder and the lower half of the high-pressure inner cylinder, the two half-groove bodies form the steam leakage groove.

5. The cylindrical high-pressure inner cylinder steam seal structure according to claim 1 is characterized in that: A plurality of steam seal rings are arranged at the end steam seals of the upper half of the high-pressure inner cylinder and the lower half of the high-pressure inner cylinder, and the annular grooves are arranged at the front and rear of the steam seal rings along the axial direction of the high-pressure inner cylinder.

6. The cylindrical high-pressure inner cylinder steam seal structure according to claim 1 is characterized in that: The steam inlet chamber formed by the upper half of the high-pressure inner cylinder and the lower half of the high-pressure inner cylinder is a tapered channel structure.

Images