Split compression ring type pump turbine guide vane middle sleeve

Abstract

The utility model discloses a split compression ring type pump turbine guide vane middle sleeve which comprises a sleeve body (4) arranged on a top cover (17), a plurality of sets of O-shaped sealing rings (10) are arranged on the contact face of the sleeve body (4) and the top cover (17), a bearing bush (5) is arranged in the middle of the inner side of the sleeve body (4), a U-shaped sealing ring (11) is arranged at the lower end of the inner side of the sleeve body (4), and a supporting ring (9) is arranged on the outer side of the sleeve body (4). A conical seal (15) is arranged at the joint of the supporting ring (9) and the sleeve body (4), second bolts (8) which are evenly distributed and used for being connected with a top cover (17) are arranged in the supporting ring (9), a plurality of sets of stainless steel pins (12) are further arranged in the supporting ring (9), and a round flange (16) is arranged on the upper side of the supporting ring (9). The possibility of water leakage can be reduced, and the pumped storage unit can operate safely and stably.

Description

Technical Field

[0001] The utility model relates to a guide vane middle sleeve of a water turbine, in particular to a guide vane middle sleeve of a split-petal pressure ring type water pump water turbine. Background Art

[0002] The water guide mechanism of the pump turbine is a valve that controls the switch of the unit. In the turbine working condition, the flow and output of the unit are controlled by the guide vane opening. In the pump working condition, the direction of the water flow outlet of the guide vane is adjusted to adapt to the water flow of the volute, so as to achieve stable and efficient operation of the pump. The water guide mechanism consists of movable guide vanes, guide vane bearings, guide vane operating connecting rods, control rings, protective devices and accessories. The movable guide vanes are located in the flow channel and withstand the hydraulic effects under various working conditions. These forces need to be borne by the bearing and guide vane sleeves, and transmitted to the foundation through the top cover and the bottom ring. There are currently two main types of guide vane sleeve structures for pump turbines: 1. A long sleeve structure in which the guide vane middle sleeve and the upper sleeve sleeve are integrated; 2. The guide vane middle sleeve and the upper sleeve sleeve are designed separately, and each guide vane sleeve flange is designed with an end cover, which is connected to the top cover by bolts to tighten the sleeve.

[0003] The currently commonly used separation design of the guide vane middle sleeve is prone to breakage of the compression ring bolts, causing the middle sleeve to be pushed out by the water flow and a large amount of water leakage at the guide vane middle sleeve, seriously affecting the safe and stable operation of the pumped storage unit. The rotation of the external O-ring of the middle sleeve is damaged, resulting in water seepage at the unit's middle sleeve, which will affect the safe and stable operation of the pumped storage unit. Utility Model Content

[0004] The purpose of the utility model is to provide a sleeve in the guide vane of a split-petal pressure ring type water pump turbine, which can reduce the possibility of water leakage and enable the pumped storage unit to operate safely and stably.

[0005] The technical solution of the utility model is as follows: a middle sleeve of a guide vane of a split-petal pressure ring type water pump turbine, comprising a sleeve body arranged on a top cover, a plurality of groups of O-rings are arranged on the contact surface between the sleeve body and the top cover, a bearing bush is arranged in the middle part of the inner side of the sleeve body, a U-shaped sealing ring is arranged at the lower end of the inner side of the sleeve body, a support ring is arranged on the outer side of the sleeve body, a cone seal is arranged at the connection between the support ring and the sleeve body, a second bolt which is evenly distributed and used for connecting the top cover is arranged in the support ring, a plurality of groups of stainless steel pins are also arranged in the support ring, a circular flange is arranged on the upper side of the support ring, a middle sleeve pressure ring which is fixed by a first bolt and a bolt stopper is arranged on the upper side of the circular flange, and an end face sealing ring is arranged at the upper end of the sleeve body.

[0006] In the aforementioned split-ring pressure-ring type water pump turbine guide vane sleeve, the end face sealing ring is provided with a third bolt connected to the sleeve body, an O-ring is provided on the connecting surface between the end face sealing ring and the sleeve body, and a U-ring is provided on the inner side of the end face sealing ring.

[0007] In the aforementioned split-ring pressure pump turbine guide vane sleeve, the number of the second bolts is 8 groups, and the second bolts are M16×120 bolts.

[0008] In the aforementioned split-ring type water pump turbine guide vane sleeve, the number of the stainless steel pins is 6 groups.

[0009] Compared with the prior art, the utility model fixes the support ring by setting a stainless steel pin and a second bolt to work together to prevent the second bolt from breaking due to a strong shear force, which causes water leakage. In addition, multiple groups of O-rings are provided on the contact surface between the sleeve body and the top cover, which has better sealing performance. A cone seal is provided at the connection between the support ring and the sleeve body, which can effectively increase the contact friction between the support ring and the sleeve body, prevent the sleeve body from rotating with the movable guide vane shaft neck, and avoid damage to the seal due to rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the utility model;

[0011] Figure 2 It is a structural schematic diagram of the utility model.

[0012] The marks in the accompanying drawings are: 1-end face sealing ring, 4-sleeve body, 5-bearing shell, 6-bolt stopper, 7-first bolt, 8-second bolt, 9-support ring, 10-O-type sealing ring, 11-U-type sealing ring, 12-stainless steel pin, 13-third bolt, 14-middle sleeve pressure ring, 15-cone seal, 16-round flange, 17-top cover. DETAILED DESCRIPTION

[0013] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0014] Embodiment. A sleeve in a guide vane of a split-petal pressure ring type water pump turbine is constructed as follows Figure 1-2 As shown, it includes a sleeve body 4 arranged on the top cover 17, a plurality of groups of O-rings 10 are arranged on the contact surface between the sleeve body 4 and the top cover 17, a bearing bush 5 is arranged at the middle part of the inner side of the sleeve body 4, a U-shaped sealing ring 11 is arranged at the lower end of the inner side of the sleeve body 4, a support ring 9 is arranged on the outer side of the sleeve body 4, a cone seal 15 is arranged at the connection between the support ring 9 and the sleeve body 4, a second bolt 8 evenly distributed and used for connecting the top cover 17 is arranged in the support ring 9, a plurality of groups of stainless steel pins 12 are also arranged in the support ring 9, a circular flange 16 is arranged on the upper side of the support ring 9, a middle sleeve pressure ring 14 fixed by the first bolt 7 and the bolt stopper 6 is arranged on the upper side of the circular flange 16, and an end face sealing ring 1 is arranged on the upper end of the sleeve body 4.

[0015] The end face sealing ring 1 is provided with a third bolt 13 connected to the sleeve body 4 , an O-type sealing ring 10 is provided on the connecting surface between the end face sealing ring 1 and the sleeve body, and a U-type sealing ring 11 is provided inside the end face sealing ring 1 .

[0016] The number of the second bolts 8 is 8 groups, and the second bolts 8 are M16×120 bolts.

[0017] The number of the stainless steel pins 12 is 6 groups.

[0018] Principle of the utility model: The present application can enhance the sealing effect by setting multiple groups of O-rings 10 on the contact surface between the sleeve body 4 and the top cover 17, and in order to prevent the sleeve body 4 from rotating, a cone seal 15 is provided at the connection between the support ring 9 and the sleeve body 4, which can effectively increase the contact friction between the support ring and the sleeve body, and can prevent the sleeve body from rotating with the rotation of the movable guide vane shaft neck, and avoid the situation where the seal is damaged by rotation. The support ring 9 and the top cover 17 are fixed by the second bolt 8 and the stainless steel pin 12. The second bolt 8 adopts M16×120 bolts and is evenly distributed in the support ring 9. The stainless steel pin 12 adopts 25×160, which can prevent the second bolt 8 from breaking under the action of the lateral shear force, thereby causing water leakage.

Claims

1. A sleeve in a guide vane of a split-petal pressure ring type water pump turbine, characterized in that: The invention comprises a sleeve body (4) arranged on a top cover (17), a plurality of groups of O-rings (10) being arranged on the contact surface between the sleeve body (4) and the top cover (17), a bearing bushing (5) being arranged at the middle part of the inner side of the sleeve body (4), a U-shaped sealing ring (11) being arranged at the lower end of the inner side of the sleeve body (4), a support ring (9) being arranged at the outer side of the sleeve body (4), a cone seal (15) being arranged at the connection between the support ring (9) and the sleeve body (4), a second bolt (8) being evenly distributed and used for connecting the top cover (17) being arranged in the support ring (9), a plurality of groups of stainless steel pins (12) being arranged in the support ring (9), a circular flange (16) being arranged on the upper side of the support ring (9), a middle sleeve pressure ring (14) being arranged on the upper side of the circular flange (16) and being fixed by means of a first bolt (7) and a bolt stopper (6), and an end face sealing ring (1) being arranged at the upper end of the sleeve body (4).

2. The guide vane sleeve of a split-petal pressure ring type water pump turbine according to claim 1, characterized in that: The end face sealing ring (1) is provided with a third bolt (13) connected to the sleeve body (4), an O-type sealing ring (10) is provided on the connecting surface between the end face sealing ring (1) and the sleeve body, and a U-type sealing ring (11) is provided inside the end face sealing ring (1).

3. The guide vane sleeve of a split-petal pressure ring type water pump turbine according to claim 1, characterized in that: The number of the second bolts (8) is 8 groups, and the second bolts (8) are M16×120 bolts.

4. The guide vane sleeve of a split-petal pressure ring type water pump turbine according to claim 1, characterized in that: The number of the stainless steel pins (12) is 6 groups.

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