Splicing type steam sealing ring structure

Abstract

The utility model provides a splicing type steam sealing ring structure, which belongs to the technical field of steam turbines and comprises a steam sealing ring, a shaft sealing sleeve, a telescopic spring, a connecting piece and a fixing bolt, the steam sealing ring consists of a plurality of groups of steam sealing blocks, and the shaft sealing sleeve consists of a plurality of groups of shaft sealing blocks. The steam seal blocks are in an open state and are far away from the rotor, so that during shutdown, under the action of spring stress of the telescopic spring, the steam seal blocks are pushed to be far away from the rotor, the radial gap between the steam seal and the rotor reaches the maximum value, and the problem of rub-impact of the steam seal can be effectively reduced; the shaft sealing sleeve composed of the shaft sealing blocks can wrap the outer ends of the steam sealing rings in a surrounding mode to conduct auxiliary fixing on the steam sealing rings, so that the steam sealing rings cannot be dislocated in the long-time using process, and then the long-time using stability is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbines, in particular to a spliced ​​steam seal ring structure. Background Art

[0002] The steam seal ring of the steam turbine is an important part of the steam turbine. A certain gap must be left between the rotating and stationary parts of the steam turbine to prevent mutual friction. Since there is a pressure difference between the inside and outside of the cylinder, the front and rear of the partition, and the two sides of the moving blades with reaction, a certain gap must be maintained between the corresponding moving and stationary parts to prevent them from colliding. Therefore, a steam seal device must be installed. Its main function is to reduce steam leakage and improve the efficiency of the steam turbine. The steam seal ring is usually installed at both ends of the steam turbine.

[0003] It has been found in actual use that the existing steam seal ring has the following shortcomings:

[0004] After the traditional comb-tooth labyrinth steam seal is installed, the steam seal gap will remain unchanged during operation without friction. After normal installation, if the steam seal gap is too large, it will cause increased steam leakage, resulting in a decrease in the thermal efficiency of the steam turbine unit; if the steam seal gap is set too small, the rotor may vibrate greatly when the unit exceeds the critical speed during startup and shutdown, which will cause the steam seal teeth to rub against the rotor;

[0005] In addition, although the spring sheet on the back of the steam seal block can make the steam seal block retreat outward to reduce the friction pressure when the steam seal block rubs against the rotor, it cannot avoid friction. In mild cases, it will cause wear of the steam seal teeth, increase the steam seal gap and thus increase heat consumption. When the friction is serious, it will cause the steam seal teeth to deform, become brittle or even break. The steam seal block is installed inside the steam turbine in a one-way splicing manner, and the two steam seal rings are fixed by bolts. In this process, the two steam seal rings are prone to misalignment;

[0006] Therefore, the present application provides a spliced ​​steam seal ring structure to meet the needs. Utility Model Content

[0007] The utility model aims to solve the problems existing in the above-mentioned background technology and proposes a spliced ​​steam seal ring structure.

[0008] The technical problem to be solved by the utility model is to provide a spliced ​​steam seal ring structure to solve the problems of the existing spliced ​​steam seal ring structure.

[0009] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0010] A spliced ​​steam seal ring structure comprises: a steam seal ring, a shaft seal sleeve, a telescopic spring, a connecting piece and a fixing bolt, wherein the steam seal ring is composed of a plurality of steam seal blocks, the shaft seal sleeve is composed of a plurality of shaft seal blocks, a docking hole is provided at one end of the steam seal block, a plug rod is provided at the other end of the steam seal block, a mounting groove is provided on the surface of the steam seal block, a placement groove is provided on the surface of the shaft seal block, a mounting hole is provided inside the placement groove of the shaft seal block, a clamping block is provided on the inner side of the shaft seal block, a telescopic spring is installed in the docking hole, and a connecting piece is installed in the placement groove of the shaft seal block via a fixing bolt.

[0011] Preferably, the steam seal ring as a whole is composed of three groups of equally divided steam seal blocks connected end to end and surrounded.

[0012] Preferably, the shaft sealing sleeve is in a ring shape, and the shaft sealing sleeve as a whole is composed of three groups of equally divided shaft sealing blocks connected end to end and surrounded.

[0013] Preferably, one end of the steam seal block is provided with two docking holes, and the other end of the steam seal block is provided with two insertion rods, and the insertion rods between the steam seal blocks are inserted into the docking holes.

[0014] Preferably, the insertion rod abuts against the end surface of the telescopic spring in the docking hole.

[0015] Preferably, the mounting groove of the steam seal ring as a whole is in a ring shape, the clamping block fits in the mounting groove, and the shaft seal block is clamped on the outer end of the steam seal ring through the clamping block.

[0016] Preferably, placement grooves are provided on both end surfaces of the shaft seal block, and the placement grooves are rectangular.

[0017] Preferably, the shaft sealing blocks are connected and fixed by connecting pieces at the head and tail ends, and the shaft sealing sleeve surrounds the outer end of the steam sealing ring.

[0018] Compared with the prior art, the utility model has at least the following beneficial effects:

[0019] 1. The steam seal blocks can be butted end to end by inserting a rod into the butt hole to complete the assembly and fixation. The rod abuts against the end face of the telescopic spring in the butt hole. The telescopic spring is elastic. When in a free state, under the action of the spring force, the steam seal blocks are in an open state and away from the rotor. When the machine is stopped, under the action of the spring stress of the telescopic spring, the steam seal blocks are pushed away from the rotor, so that the radial clearance between the steam seal and the rotor reaches the maximum value, which can effectively reduce the problem of steam seal collision.

[0020] 2. By installing a shaft sealing sleeve on the outer end of the steam sealing ring, the shaft sealing sleeve composed of the shaft sealing block can be wrapped around the outer end of the steam sealing ring, which can not only ensure the overall operating range of the steam sealing ring, but also assist in fixing the steam sealing ring, so that during long-term use, there will be no misalignment between the steam sealing rings, thereby ensuring long-term stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable those skilled in the relevant art to make and use the present disclosure.

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 It is a schematic diagram of the disassembled structure of the steam seal ring and the shaft seal sleeve of the utility model;

[0024] Figure 3 This is a schematic diagram of the specific internal connection structure of the steam seal ring of the utility model;

[0025] Figure 4 This is a schematic diagram of the specific structure of the steam seal block of the utility model;

[0026] Figure 5 It is a schematic diagram of the specific structure of the shaft seal block of the utility model.

[0027] [reference numerals]

[0028] 1-steam seal ring; 2-shaft seal sleeve; 3-telescopic spring; 4-connecting plate; 5-fixing bolt; 101-steam seal block; 201-shaft seal block; 1011-docking hole; 1012-insertion rod; 1013-installation slot; 2011-placing slot; 2012-installation hole; 2013-block.

[0029] As shown in the figure, in order to clearly implement the structure of the embodiment of the utility model, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the utility model to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the attached claims. DETAILED DESCRIPTION

[0030] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5A spliced ​​steam seal ring structure is shown in an embodiment of the utility model, comprising: a steam seal ring 1, a shaft seal sleeve 2, a telescopic spring 3, a connecting piece 4 and a fixing bolt 5, the steam seal ring 1 is composed of a plurality of steam seal blocks 101, the shaft seal sleeve 2 is composed of a plurality of shaft seal blocks 201, a docking hole 1011 is provided at one end of the steam seal block 101, a plug rod 1012 is provided at the other end of the steam seal block 101, a mounting groove 1013 is provided on the surface of the steam seal block 101, a placement groove 2011 is provided on the surface of the shaft seal block 201, a mounting hole 2012 is provided inside the placement groove 2011 of the shaft seal block 201, a clamping block 2013 is provided on the inner side of the shaft seal block 201, a telescopic spring 3 is installed in the docking hole 1011, and a connecting piece 4 is installed in the placement groove 2011 of the shaft seal block 201 through a fixing bolt 5.

[0031] In this embodiment, the steam seal ring 1 as a whole is composed of three equally divided steam seal blocks 101 connected end to end and surrounded.

[0032] In this embodiment, the shaft sealing sleeve 2 is in a ring shape, and the shaft sealing sleeve 2 as a whole is composed of three groups of equally divided shaft sealing blocks 201 connected end to end and surrounded.

[0033] In this embodiment, two docking holes 1011 are provided at one end of the steam sealing block 101, and two insertion rods 1012 are provided at the other end of the steam sealing block 101, and the insertion rods 1012 between the steam sealing blocks 101 are inserted into the docking holes 1011, so that the steam sealing blocks 101 can be docked end to end by inserting the insertion rods 1012 into the docking holes 1011 to complete the assembly and fixation.

[0034] In this embodiment, the insertion rod 1012 abuts against the end face of the telescopic spring 3 in the docking hole 1011. The telescopic spring 3 has its own elasticity. When in a free state, under the action of the spring force, the steam seal block 101 is in an open state and away from the rotor. When the machine is shut down, the spring stress of the telescopic spring 3 pushes the steam seal block 101 away from the rotor, so that the radial clearance between the steam seal and the rotor reaches the maximum value, which can effectively reduce the problem of steam seal collision.

[0035] In this embodiment, the overall installation groove 1013 of the steam seal ring 1 is in a ring shape, the clamping block 2013 fits with the installation groove 1013, and the shaft seal block 201 is clamped at the outer end of the steam seal ring 1 through the clamping block 2013. The shaft seal block 201 of the shaft seal sleeve 2 can be wrapped around the outer end of the steam seal ring 1, which can not only ensure the overall operating range of the steam seal ring 1, but also assist in fixing the steam seal ring 1, so that during long-term use, there will be no misalignment between the steam seal rings 1, thereby ensuring stability during long-term use.

[0036] In this embodiment, placement grooves 2011 are provided on both end surfaces of the shaft seal block 201 , and the placement grooves 2011 are rectangular.

[0037] In this embodiment, the shaft sealing blocks 201 are connected and fixed by connecting pieces 4 at the head and tail ends, and the shaft sealing sleeve 2 surrounds the outer end of the steam sealing ring 1.

Claims

1. A spliced ​​steam seal ring structure, characterized in that: include: A steam seal ring (1), a shaft seal sleeve (2), a telescopic spring (3), a connecting piece (4) and a fixing bolt (5), wherein the steam seal ring (1) is composed of a plurality of steam seal blocks (101), the shaft seal sleeve (2) is composed of a plurality of shaft seal blocks (201), one end of the steam seal block (101) is provided with a docking hole (1011), the other end of the steam seal block (101) is provided with a plug rod (1012), and the surface of the steam seal block (101) is provided with a mounting groove (1012). 013), a placement groove (2011) is provided on the surface of the shaft seal block (201), a mounting hole (2012) is provided inside the placement groove (2011) of the shaft seal block (201), a clamping block (2013) is provided on the inner side of the shaft seal block (201), a telescopic spring (3) is installed in the docking hole (1011), and a connecting piece (4) is installed in the placement groove (2011) of the shaft seal block (201) via a fixing bolt (5).

2. The spliced ​​steam seal ring structure according to claim 1 is characterized in that: The steam seal ring (1) as a whole is composed of three groups of equally divided steam seal blocks (101) connected end to end and surrounding each other.

3. The spliced ​​steam seal ring structure according to claim 1 is characterized in that: The shaft sealing sleeve (2) is in a ring shape, and the shaft sealing sleeve (2) as a whole is composed of three groups of equally divided shaft sealing blocks (201) connected end to end and surrounding each other.

4. The spliced ​​steam seal ring structure according to claim 1 is characterized in that: One end of the steam seal block (101) is provided with two docking holes (1011), and the other end of the steam seal block (101) is provided with two insertion rods (1012), and the insertion rods (1012) between the steam seal blocks (101) are inserted into the docking holes (1011).

5. The spliced ​​steam seal ring structure according to claim 1 is characterized in that: The insertion rod (1012) abuts against the end surface of the telescopic spring (3) in the docking hole (1011).

6. The spliced ​​steam seal ring structure according to claim 1 is characterized in that: The overall mounting groove (1013) of the steam seal ring (1) is in a ring shape, the clamping block (2013) fits in the mounting groove (1013), and the shaft seal block (201) is clamped on the outer end of the steam seal ring (1) through the clamping block (2013).

7. The spliced ​​steam seal ring structure according to claim 1 is characterized in that: The surfaces of both ends of the shaft seal block (201) are provided with placement grooves (2011), and the placement grooves (2011) are rectangular.

8. The spliced ​​steam seal ring structure according to claim 1 is characterized in that: The shaft sealing blocks (201) are connected and fixed via connecting pieces (4) at the head and tail ends, and the shaft sealing sleeve (2) surrounds the outer end of the steam sealing ring (1).

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