Anti-displacement connecting plate pin device of water turbine

Abstract

The utility model relates to the technical field of connecting plate pins, and particularly discloses a water turbine anti-dislocation connecting plate pin device which comprises a connecting plate pin body, a threaded hole is formed in the center of the bottom of the connecting plate pin body, a bolt is installed in the threaded hole, and a gasket is fixedly connected to the head of the bolt. The diameter of the gasket is larger than that of the thin end of the connecting plate pin body. A preset distance is reserved between the gasket and the bottom end of the connecting plate pin body, and the gasket is used for limiting the connecting plate pin body from being lifted upwards in the action process of the water guide mechanism; the adjustable mechanical limiting device is additionally arranged at the bottom of the connecting plate pin, the axial displacement of the connecting plate pin is effectively restrained, the structure is simple, the main body structure of an original water guide mechanism does not need to be changed, the diameter of the gasket and the screwing depth of the bolt can be adjusted according to needs, and the connecting requirements of control rings and connecting levers with different thicknesses can be met.

Description

Technical Field

[0001] This utility model belongs to the field of connecting plate pin technology, specifically relating to a connecting plate pin device for preventing displacement of a water turbine. Background Technology

[0002] The turbine's guide vane mechanism is a core component for regulating water flow direction and volume, ensuring the safe operation of the unit. Its transmission device typically consists of components such as a control ring, double booms, crank arms, and connecting pins. The connecting pin, as a crucial transmission component connecting the control ring and crank arms, must withstand alternating loads and maintain a stable connection during guide vane operation. In traditional designs, the connecting pin is precision-machined to ensure accurate fit with the pin holes. After installation, it is vertically inserted into the pin holes on both sides of the double boom, relying on its own weight and friction to maintain its position.

[0003] However, due to the slight angular deviation between the control ring and the crank arm during the operation of the water guiding mechanism, or the influence of factors such as mechanical vibration and water flow impact, the connecting pin lacks effective axial constraint, and it is difficult to completely limit its displacement by relying solely on the fit clearance and its own weight. Utility Model Content

[0004] The purpose of this utility model is to provide a turbine anti-displacement connecting plate pin device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A turbine anti-displacement connecting plate pin device includes:

[0007] The connecting pin body has a threaded hole at the center of its bottom, a bolt is installed in the threaded hole, and a washer is fixedly connected to the head of the bolt. The diameter of the washer is larger than the diameter of the thin end of the connecting pin body.

[0008] A preset gap is left between the gasket and the bottom end of the connecting pin body to limit the upward lifting of the connecting pin body during the operation of the water guiding mechanism.

[0009] Preferably, the thread specification of the bolt matches the threaded hole, and the screwing depth of the bolt is adjustable.

[0010] Preferably, the gasket is made of stainless steel or carbon steel and has a thickness of 3-5 mm.

[0011] Preferably, the outer diameter of the thin end of the connecting pin body is 28-32 mm, and the diameter of the gasket is 5-8 mm larger than the outer diameter of the thin end.

[0012] Preferably, the depth of the threaded hole is 1 / 4 to 1 / 3 of the total length of the connecting pin body, and it is located at the axial center of the connecting pin body.

[0013] Preferably, the device is suitable for the water guiding mechanism of a mixed-flow turbine. The water guiding mechanism includes a control ring, a double arm, two lugs, and a crank arm. The connecting pin body is disposed inside the lugs. The two lugs are respectively connected to the control ring and the crank arm. The double arm is connected to the control ring and the crank arm through the connecting pin body and the lugs.

[0014] Preferably, the preset spacing is 2-4mm.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] (1) By adding an adjustable mechanical limit device at the bottom of the connecting plate pin, the axial displacement of the connecting plate pin is effectively constrained. The structure is simple and does not require modification of the original water guiding mechanism. The gasket diameter and bolt screwing depth can be adjusted as needed, and can adapt to the connection requirements of control rings and crank arms of different thicknesses.

[0017] (2) By adopting standardized parts and simple processing technology, manufacturing costs and maintenance time are saved. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present utility model;

[0019] Figure 2 This is a cross-sectional view of the present invention;

[0020] Figure 3 This is an exploded view of the present invention;

[0021] In the diagram: 1. Connecting pin body; 2. Threaded hole; 3. Bolt; 4. Washer; 5. Control ring; 6. Crank arm; 7. Double arm; 8. Ear handle. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not 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 effort are within the protection scope of the present utility model.

[0023] Example 1:

[0024] Please see Figures 1-3 As shown, a turbine anti-displacement connecting plate pin device includes:

[0025] The connecting pin body 1 has a threaded hole 2 at the bottom center position. A bolt 3 is installed in the threaded hole 2. A washer 4 is fixedly connected to the head of the bolt 3. The diameter of the washer 4 is larger than the diameter of the thin end of the connecting pin body 1.

[0026] A preset gap is left between the gasket 4 and the bottom end of the connecting pin body 1 to limit the connecting pin body 1 from rising upward during the operation of the water guiding mechanism. The gasket 4 is a 304 stainless steel gasket with a thickness of 4mm and a diameter of 38mm, and the surface is sandblasted.

[0027] In one embodiment of this utility model, the thread specification of the bolt 3 matches the threaded hole 2, the screwing depth of the bolt 3 is adjustable, and the bolt 3 is an M8×50mm internal hexagonal stainless steel bolt with a galvanized surface for rust prevention.

[0028] In one embodiment of this utility model, the gasket 4 is made of stainless steel or carbon steel and has a thickness of 3-5 mm.

[0029] In one embodiment of this utility model, the connecting pin body 1 is made of No. 45 steel, with a total length of 150mm, an outer diameter of 30mm at the narrow end, and an outer diameter of 55mm at the thick end.

[0030] In one embodiment of this utility model, the threaded hole 2 is an M8 threaded hole with a working depth of 40mm, and is located at the axial center of the connecting pin body 1.

[0031] In one embodiment of this utility model, the device is applicable to the water guiding mechanism of a mixed-flow turbine. The water guiding mechanism includes a control ring 5, a double arm 7, two lugs 8, and a crank arm 6. The connecting pin body 1 is disposed inside the lugs 8. The two lugs 8 are respectively connected to the control ring 5 and the crank arm 6. The double arm 7 is connected to the control ring 5 and the crank arm 6 through the connecting pin body 1 and the lugs 8.

[0032] In one embodiment of this utility model, the preset spacing is 2-4mm.

[0033] As can be seen from the above, during use, an electric drill is used to drill a φ6.8mm through hole at the center of the bottom of the connecting pin body 1. Then, an M8 tap is used to tap the thread to form a threaded hole 2. The bolt 3 is screwed into the threaded hole 2 to a depth of 30mm, so that the bolt head and the bottom of the connecting pin body 1 form a preset distance of 3mm. The washer 4 is placed under the head of the bolt 3 and fixed by welding. After stopping the machine, the original connecting pin and double arm 7 are removed. The modified connecting pin body 1 is inserted into the pin hole and lug on the control ring 5. The screwing depth of the bolt 3 is adjusted so that the washer 4 maintains a 2mm gap with the bottom surface of the control ring 5 and the crank arm 6.

[0034] Example 2:

[0035] The difference from Embodiment 1 is that, for the thickness difference at the connection between the control ring 5 and the crank arm 6, such as the control ring being 40mm thick and the crank arm being 35mm thick, the bolt 3 is changed to an M8×60mm bolt, the depth of the threaded hole 2 is adjusted to 45mm, and the gasket 4 is a stepped gasket with an upper diameter of 38mm and a lower diameter of 35mm.

[0036] As can be seen from the above, by adjusting the screwing depth of bolt 3, the control ring side is screwed in 35mm and the crank arm side is screwed in 30mm, so that both sides of the gasket 4 maintain a 2mm gap with the bottom surface of the component.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for preventing misalignment of a water turbine connecting plate pin, characterized in that, include: The connecting pin body (1) has a threaded hole (2) at the bottom center position. A bolt (3) is installed in the threaded hole (2). A washer (4) is fixedly connected to the head of the bolt (3). The diameter of the washer (4) is larger than the diameter of the thin end of the connecting pin body (1). A preset gap is left between the gasket (4) and the bottom end of the connecting pin body (1) to limit the connecting pin body (1) from rising upward during the operation of the water guiding mechanism.

2. The anti-displacement connecting plate pin device for a water turbine according to claim 1, characterized in that: The thread specification of the bolt (3) matches the threaded hole (2), and the screwing depth of the bolt (3) is adjustable.

3. The anti-displacement connecting plate pin device for a water turbine according to claim 1, characterized in that: The gasket (4) is made of stainless steel or carbon steel and has a thickness of 3-5 mm.

4. The anti-displacement connecting plate pin device for a water turbine according to claim 1, characterized in that: The outer diameter of the thin end of the connecting pin body (1) is 28-32mm, and the diameter of the gasket (4) is 5-8mm larger than the outer diameter of the thin end.

5. The anti-displacement connecting plate pin device for a water turbine according to claim 1, characterized in that: The depth of the threaded hole (2) is 1 / 4 to 1 / 3 of the total length of the connecting pin body (1), and it is located at the axial center of the connecting pin body (1).

6. The anti-displacement connecting plate pin device for a water turbine according to claim 1, characterized in that: The device is applicable to the water guiding mechanism of a mixed-flow turbine. The water guiding mechanism includes a control ring (5), a double arm (7), two lugs (8), and a crank arm (6). The connecting pin body (1) is located inside the lugs (8). The two lugs (8) are respectively connected to the control ring (5) and the crank arm (6). The double arm (7) is connected to the control ring (5) and the crank arm (6) through the connecting pin body (1) and the lugs (8).

7. The anti-displacement connecting plate pin device for a water turbine according to claim 1, characterized in that: The preset spacing is 2-4mm.

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