Water turbine water pressure type end face main shaft sealing structure easy to disassemble

Abstract

The utility model provides an easy-to-disassemble water turbine water pressure type end face main shaft sealing structure which comprises a sealing support (1), a sealing groove outer wall (2), a wear-resistant plate (3) and a combined sealing block (5). The sealing support (1) is installed on a water turbine top cover (8) in a sleeved mode. A sealing groove outer wall (2) and a combined sealing block (5) are arranged on the sealing support (1); the sealing groove outer wall (2) is used for clamping the combined sealing block (5) between the sealing groove outer wall (2) and the sealing support (1); and one end, far away from the sealing support (1), of the combined sealing block (5) is matched with the wear-resistant plate (3). By adopting the structure that the combined sealing block is combined with the outer wall of the sealing groove, not only can the sealing and fixing effects be ensured, but also the combined sealing block can be allowed to freely move along the shaft after being dismantled.

Description

Technical Field

[0001] The utility model relates to the technical field of water turbines, and particularly relates to a detachable water pressure type end face main shaft seal structure for a water turbine. Background Art

[0002] The main shaft seal of a water turbine is installed above the runner of the water turbine and below the water guide bearing, and mainly functions to seal the water flowing out between the rotating part and the fixed part of the top cover of the water turbine. It is an important water sealing device during the operation of the water turbine, and requires high reliability, as long a service life as possible, and a simple structure.

[0003] During the flood season, the water quality of the hydro-generator unit is generally poor, and the sediment content in the water is relatively high. After the hydro-generator unit operates for a long time under the condition of heavy sediment, the seal structure will be blocked due to cavitation adhesion. At this time, the seal structure needs to be removed and cleaned. However, according to the existing structure, the wear-resistant plate and accessories need to be removed before the seal block can be removed. Often, the support ring of the seal block is also stuck with the seal groove, and the support ring needs to be broken in the seal groove before it can be removed, which takes a lot of time, affects power generation, and has many disassembly procedures and great working difficulty. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art, and provides a detachable water pressure type end face main shaft seal structure for a water turbine to solve the problems of difficult removal due to blockage, large workload and great working difficulty mentioned in the above background art.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A detachable water pressure type end face main shaft seal structure for a water turbine, including a seal support, an outer wall of a seal groove, a wear-resistant plate, and a combined seal block, wherein:

[0007] The seal support is of a circular ring structure and is sleeved and installed on the top cover of the water turbine; the outer wall of the seal groove and the combined seal block are installed on the seal support;

[0008] The combined seal block is an annular seal body, and the outer wall of the seal groove clamps the combined seal block between the outer wall of the seal groove and the seal support;

[0009] A water inlet pipe is further installed on the seal support; one end of the water inlet pipe is connected to external water supply, and the other end supplies sealing power water for the combined seal block.

[0010] Optionally or preferably, the combined seal block includes a support ring and a seal ring; the seal ring is installed on the top of the support ring; the seal ring is a Setra seal ring, and the seal ring and the wear-resistant plate play a role in sealing water after combination.

[0011] Optionally or preferably, it further includes a guide pin; the guide pin passes through the combined seal block and is immersed in the seal support, providing a guiding and fixing effect for the combined seal block.

[0012] Optionally or preferably, the outer wall of the seal groove is a split and detachable structure, which is composed of a combination of multiple outer wall petals; each of the outer wall petals is fixed on the seal support by an outer wall petal positioning pin and an outer wall petal screw.

[0013] Optionally or preferably, the wear-resistant plate is clamped and fixed on the water turbine main shaft, and the wear-resistant plate rotates synchronously with the water turbine main shaft.

[0014] Optionally or preferably, sealing rings are provided on both the inner and outer sides of the combined seal block to prevent water leakage due to gaps between the combined seal block and the seal support and between the combined seal block and the outer wall of the seal groove.

[0015] Optionally or preferably, it further includes a water throwing ring; the water throwing ring is installed on the outer side of the upper wear-resistant plate to prevent the splash of the main shaft seal water supply.

[0016] Based on the above technical solutions, an easily detachable water pressure type end face main shaft seal structure of a water turbine provided by the present utility model can produce the following technical effects:

[0017] (1) In the present utility model, the combined seal block is used to replace the traditional seal ring, which is easy to remove.

[0018] (2) The present utility model adopts a structure combining the combined seal block and the outer wall of the seal groove, which can not only ensure the sealing and fixing effects, but also allow the free axial movement of the combined seal block after removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model, and for those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0020] Figure 1 It is a schematic structural diagram of the present utility model;

[0021] Figure 2 It is a partial enlarged schematic diagram of the combined seal block and the guide pin in the present utility model;

[0022] Figure 3 It is a schematic structural diagram of the outer wall of the seal groove in the present utility model;

[0023] Figure 4 It is a partial enlarged schematic diagram of the split and detachable type in the outer wall of the seal groove in the present utility model;

[0024] Brief Description of the Drawings:

[0025] 1 - Sealing support, 2 - Outer wall of the sealing groove, 3 - Wear-resistant plate, 4 - Water throwing ring, 5 - Composite sealing block, 6 - Guide pin, 7 - Sealing water inlet pipe, 8 - Turbine top cover, 9 - Turbine main shaft,

[0026] 201 - Outer wall flap positioning pin, 202 - Outer wall flap screw,

[0027] 501 - Support ring, 502 - Sealing ring, 503 - Sealing gasket. Detailed Implementation Manner

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are only a part rather than all of the embodiments of the present utility model. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0029] In a preferred embodiment:

[0030] This embodiment provides a detachable hydrostatic end face main shaft sealing structure for a water turbine, as Figure 1 shown, including a sealing support 1, an outer wall 2 of the sealing groove, a wear-resistant plate 3, and a composite sealing block 5, wherein:

[0031] The sealing support 1 is of an annular structure and is sleeved and installed on the turbine top cover 8; the sealing support 1 is provided with an outer wall 2 of the sealing groove and a composite sealing block 5;

[0032] The composite sealing block 5 is an annular sealing body, and the outer wall 2 of the sealing groove clamps the composite sealing block 5 between the outer wall 2 of the sealing groove and the sealing support 1;

[0033] The sealing support 1 is further provided with a water inlet pipe 7; one end of the water inlet pipe 7 is connected to external water supply, and the other end supplies sealing power water to the composite sealing block 5.

[0034] Furthermore, in this embodiment, as Figure 2 shown, the composite sealing block 5 includes a support ring 501 and a sealing ring 502; the sealing ring 502 is installed on the top of the support ring 501. Specifically, the support ring 501 is made of aluminum; the sealing ring 502 is a Seastar sealing ring, and the sealing ring 502 and the wear-resistant plate 3 together play a role in sealing water. Furthermore, the sealing ring 502 adopts a split design and forms an inserted combination with the wear-resistant plate 3, which is convenient for disassembly and assembly.

[0035] Further, in this embodiment, a guide pin 6 is further included; the guide pin 6 passes through the combined seal block 5 and is immersed in the seal support 1 to provide a guiding and fixing effect for the combined seal block 5; further, the installation height of the top of the guide pin 6 is lower than the installation height of the seal ring 502, which can not only limit the combined seal block 5 but also does not affect the decomposition of the combined seal block 5 into the support ring 501 and the seal ring 502.

[0036] Further, in this embodiment, as Figure 3 and Figure 4 shown, the outer wall 2 of the seal groove is a split and detachable structure, which is composed of a combination of multiple outer wall petals; each outer wall petal is fixed on the seal support 1 by an outer wall petal positioning pin 201 and an outer wall petal screw 202; in this embodiment, when the combined seal block 5 fails and needs to be replaced, the wear-resistant plate 3 does not need to be disassembled. After removing the positioning pin 201 and the outer wall petal screw 202, the outer wall 2 of the seal groove can be directly removed. After removing the outer wall 2 of the seal groove, the combined seal block 5 is no longer restricted and can be easily moved up and down.

[0037] Further, in this embodiment, the wear-resistant plate 3 is clamped and fixed on the water turbine main shaft 9, and the wear-resistant plate 3 rotates synchronously with the water turbine main shaft 9. In this embodiment, the combination of the wear-resistant plate 3 and the seal ring 502 plays a role in sealing water.

[0038] Further, in this embodiment, sealing rings are provided on both the inner and outer sides of the combined seal block 5 to prevent water leakage due to gaps between the combined seal block 5 and the seal support 1 and between the combined seal block 5 and the outer wall 2 of the seal groove.

[0039] Further, in this embodiment, a water throwing ring 4 is further included; the water throwing ring 4 is installed on the outside of the upper wear-resistant plate 3 to prevent the water supply of the main shaft seal from splashing.

[0040] Further, in this embodiment, the seal support 1, the outer wall 2 of the seal groove, and the guide pin 6 are all made of stainless steel to avoid being cavitated in water for a long time and adhering to the aluminum support ring of the combined seal block 5, thereby damaging the main shaft seal equipment.

[0041] The usage method and working principle of this embodiment are as follows:

[0042] The outer wall 2 of the sealing groove of the present embodiment is designed to be detachable in petals. When the combined sealing block 5 fails and needs to be replaced, the anti-wear plate 3 component can be kept intact. After removing the combined pin, the positioning pin and the fixing screws of the sealing support 1 can be removed, and the outer wall 2 of the sealing groove can be removed; after the outer wall 2 of the sealing groove is taken out, the combined sealing block 5 is not restricted by the outer wall and can be easily moved up and down; the height of the guide pin 6 is designed to be moderate, which can not only play a role in limiting the sealing block, but also does not affect the decomposition and removal of the combined sealing block 5; the sealing ring of the combined sealing block 5 is designed to be in a petal type, and the combined position is set to be an easy-to-disassemble plug-in type; when the combined sealing block 5 needs to be replaced, after the outer wall 2 of the sealing groove is removed, the combined sealing block 5 can be dropped, and after removing the combined screws of the sealing ring 502 and the support ring 501, the sealing ring 502 and the support ring 501 can be easily taken out over the guide pin 6. In this way, when the combined sealing block 5 fails and its sealing ring or support ring needs to be replaced, or when the support ring 501 is stuck with the outer wall 2 of the sealing groove, it can be quickly repaired without removing the anti-wear plate 3.

[0043] The easily detachable hydraulic turbine hydraulic end face main shaft seal structure provided in this embodiment has the following advantages:

[0044] (1) The sealing support 1, the sealing groove outer wall 2 and the guide pin 6 of this embodiment are all designed to be made of stainless steel, and the support ring 501 in the combined sealing block 5 is made of aluminum, which can not only prevent the sealing groove outer wall 2 and other structures from adhering to the support ring 501 due to cavitation in water for a long time, thereby damaging the main shaft sealing device; but also reduce the weight of the combined sealing block 5 and reduce the water pressure requirement;

[0045] (2) The outer wall 2 of the sealing groove in this embodiment is designed to be detachable in petals. When the combined sealing block 5 fails and needs to be replaced, the outer wall 2 of the sealing groove can be removed without removing the anti-wear plate 3. After the outer wall 2 of the sealing groove is removed, the combined sealing block 5 can be easily moved up and down without being restricted by the outer wall.

[0046] (3) The sealing ring 501 in the combined sealing block 5 is designed to be a split-petal type, and the combined position is set to be a plug-in type that is easy to disassemble and assemble; when the combined sealing block 5 needs to be replaced, after the outer wall 2 of the sealing groove is removed, the combined sealing block 5 can be dropped, and after the combined screws of the sealing ring 502 and the support ring 501 are removed, the sealing ring 502 can be easily taken out;

[0047] (4) The height of the guide pin 6 is designed to be moderate, which can not only play a role in limiting the block of the combined seal 5, but also does not affect the disassembly and removal of the combined seal block 5; the distance from the top of the guide pin 6 to the anti-wear plate 3 is greater than the height of the sealing ring 502 and the support ring 501, and the sealing ring 502 and the support ring 501 can be easily removed after being disassembled.

[0048] The above are only the preferred embodiments of the present utility model. It should be understood that the present utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the techniques or knowledge in the relevant field. As long as the changes and variations made by those skilled in the art do not depart from the spirit and scope of the present utility model, they should all be within the protection scope of the appended claims of the present utility model.

Claims

1. An easily detachable water turbine water pressure type end face main shaft seal structure, characterized in that: It includes a sealing support (1), an outer wall of the sealing groove (2), an anti-wear plate (3), and a combined sealing block (5), where: The sealing support (1) is of an annular structure and is sleeved and installed on the top cover (8) of the water turbine; the sealing support (1) is provided with the outer wall of the sealing groove (2) and the combined sealing block (5); The combined sealing block (5) is an annular sealing body, and the outer wall of the sealing groove (2) clamps the combined sealing block (5) between the outer wall of the sealing groove (2) and the sealing support (1); The sealing support (1) is also provided with a water inlet pipe (7); one end of the water inlet pipe (7) is connected to external water supply, and the other end is the sealing power water supply for the combined sealing block (5).

2. The water pressure type end face main shaft seal structure of a detachable water turbine according to claim 1, characterized in that: The combined sealing block (5) includes a support ring (501) and a sealing ring (502); the sealing ring (502) is installed on the top of the support ring (501); the sealing ring (502) is a Setzler sealing ring, and the sealing ring (502) and the anti-wear plate (3) play a role in sealing water when combined.

3. The water pressure type end face main shaft seal structure of the detachable water turbine according to claim 1, characterized in that: It also includes a guide pin (6); the guide pin (6) passes through the combined sealing block (5) and is inserted into the sealing support (1) to provide a guiding and fixing effect for the combined sealing block (5).

4. The detachable water turbine water pressure type end face main shaft seal structure according to claim 1, characterized in that: The outer wall of the sealing groove (2) is a split and detachable structure, which is composed of a plurality of outer wall petals; each outer wall petal is fixed on the sealing support (1) by an outer wall petal positioning pin (201) and an outer wall petal screw (202).

5. The water pressure type end face main shaft seal structure of a detachable water turbine according to claim 1, characterized in that: The anti-wear plate (3) is clamped and fixed on the water turbine main shaft (9), and the anti-wear plate (3) rotates synchronously with the water turbine main shaft (9).

6. The water pressure type end face main shaft seal structure of the detachable water turbine according to claim 1, characterized in that: Sealing rings are provided on both the inner and outer sides of the combined sealing block (5) to prevent water leakage due to gaps between the combined sealing block (5) and the sealing support (1), and between the combined sealing block (5) and the outer wall of the sealing groove (2).

7. The detachable water turbine water pressure type end face main shaft seal structure according to claim 1, characterized in that: It also includes a water throwing ring (4); the water throwing ring (4) is installed on the outside of the upper anti-wear plate (3) to prevent the splash of the main shaft seal water supply.

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