A device for preventing the rotating shaft of a steam turbine rotating partition connecting rod from falling off

Abstract

The utility model discloses an anti-detachment device for a rotating shaft of a connecting rod of a rotating partition of a steam turbine, comprising a connecting rod one, which is symmetrically concave on both sides and formed with grooves, in which a connecting rod two and a connecting rod three are horizontally inserted respectively, and holes are penetrated at the connection areas between the connecting rod one and the connecting rod two, and between the connecting rod one and the connecting rod three; there are two rotating shafts; after the anti-detachment screw is changed into an anti-detachment baffle, the anti-detachment baffle can be designed with a larger size, and will have higher strength than the anti-rotation screw under the condition of the same material; the anti-detachment baffle does not contact the end plate with each other, and under normal operating conditions, when the connecting rod one and the rotating shaft move, the anti-detachment baffle is not affected by the rotating torque, and if the rotating shaft falls off, the anti-detachment baffle is only affected by the force of the rotating shaft moving backward, while the anti-rotation screw in the prior art is affected by the superposition of the transmission torque and the force of the transmission shaft moving backward, the anti-detachment baffle is less stressed and will be more durable than the anti-rotation screw.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam turbine rotating partitions, and in particular relates to a device for preventing a rotating shaft of a connecting rod of a steam turbine rotating partition from falling off. Background Art

[0002] Steam turbine is a rotary steam power device, commonly used in power plants, and also widely used in chemical, petroleum, metallurgy, natural gas and other industrial fields. The rotating diaphragm of steam turbine is a diaphragm that changes the flow area of ​​the stator blades by rotating the rotating ring placed in front of the stator blades to control the steam extraction amount. It is usually used in steam extraction heating steam turbine units.

[0003] At present, the change of the opening degree of the rotating diaphragm of some steam turbines is achieved by operating multiple interconnected connecting rods with external force, so that the rotating ring of the rotating diaphragm rotates to change the steam flow area, wherein multiple connecting rods are connected by a rotating shaft. When the connecting rods are operated, they will rotate around the rotating shaft. The rotating shaft will be gradually separated from the shaft hole due to the torque transmitted by the rotation of the connecting rods for a long time.

[0004] like Figure 6 As shown, at present, the anti-slip device of the rotating shaft of the rotating partition connecting rod of some steam turbines is directly fixed on the connecting rod by anti-slip screws. When multiple connecting rods are operated, the rotational torque received by the rotating shaft will be directly transmitted to the anti-slip screws. When it is subjected to the rotational torque and rotation, under the superposition of the force of falling off and moving back, it is easy for the anti-slip screws to exceed the yield strength and break, and it will also cause cracks in the end plate of the rotating shaft. In severe cases, it will cause the rotating shaft to fall off, resulting in the inability to adjust the opening of the rotating partition and the inability to adjust the steam turbine. In addition, the broken anti-rotation screws and the fallen rotating shaft will fall into the steam turbine cylinder and the steam extraction pipe, causing damage to equipment components and economic losses, and also posing a safety hazard to the safe and stable operation of the steam turbine.

[0005] To this end, the utility model provides a device for preventing a rotating shaft of a rotating partition connecting rod of a steam turbine from falling off. Utility Model Content

[0006] The utility model aims to provide a device for preventing the rotating shaft of a rotating partition connecting rod of a steam turbine from falling off, so as to solve the problem in the above-mentioned background technology that the existing method of limiting the rotation by bolts is prone to breakage and affects the safe and stable operation of the steam turbine.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a device for preventing a rotating shaft of a rotating partition connecting rod of a steam turbine from falling off, comprising a connecting rod 1, which is symmetrically concave on both sides and is formed with a groove, in which a connecting rod 2 and a connecting rod 3 are horizontally inserted respectively in the grooves at the two side positions, and holes are penetrated at the connection areas between the connecting rod 1 and the connecting rod 2, and between the connecting rod 1 and the connecting rod 3; two rotating shafts are provided, and are respectively penetrated in the holes at the positions of the connecting rod 1 and the connecting rod 2, and between the connecting rod 1 and the connecting rod 3 in a centrally symmetrical shape, and also include an anti-falling assembly, which is installed on the connecting rod 1 and is covered on the outside of the locking end of the rotating shaft, and the anti-falling assembly is composed of a limit member and a connecting member, wherein the limit member is an anti-falling baffle, which has a horizontal portion and a vertical portion, wherein the horizontal portion extends toward the axis of the rotating shaft; the connecting member is arranged between the vertical portion of the limit member and the connecting rod 1, so as to achieve the purpose of firmly connecting and quickly separating the two.

[0008] Preferably, an end plate is fixed to one end of the rotating shaft, the end plate is a locking end, and the diameter of the end plate is larger than the diameter of the rotating shaft, and is limitedly fitted with the outer surface of the connecting rod.

[0009] Preferably, an annular groove is provided on the top end surface of the connecting rod, and a horizontal connecting portion is fixed to the bottom end of the vertical portion of the anti-slip baffle, and the connecting piece includes a threaded pressure ring built into the annular groove, and the bottom end surface of the threaded pressure ring abuts against the top end surface of the connecting portion; a T-shaped slider is also fixed to the bottom end surface of the connecting portion, and a T-shaped slot is provided on the bottom end surface of the annular groove, and the T-shaped slider slides horizontally in the T-shaped slot.

[0010] Preferably, one end of the T-slot extends upward and penetrates the annular groove, and the inner width of the end is equal to the width of the T-slot slider, thereby facilitating the removal and placement of the T-slot slider.

[0011] Preferably, the top end of the connecting rod is symmetrically provided with straight grooves along the rotation axis, a horizontal guide prism is fixed inside the opening at one end of the straight groove, and a hole for the guide prism to pass through is provided on the vertical portion of the anti-detachment baffle, so as to realize the horizontal movement of the anti-detachment baffle along the guide prism, and the guide prism is also provided with a strip groove, i.e., the H area in the figure, and a connecting bolt passes through the inside of the strip groove, the bottom end of the connecting bolt is screwed into the bottom of the anti-detachment baffle, and the top of the connecting bolt is provided with a locking nut, which fits with the top surface of the guide prism. In use, the anti-detachment baffle is limited by tightening the locking nut.

[0012] Preferably, the anti-slip baffle is an inverted Z-shape, and screw holes for connecting bolts to be screwed into are reserved on the anti-slip baffle.

[0013] Preferably, the inner side surfaces of the horizontal and vertical parts of the anti-detachment baffle do not contact the end plate, and a gap is reserved between the two. Under normal operating conditions, when the connecting rod and the rotating shaft move, the anti-detachment baffle is not affected by the rotational torque. If the rotating shaft falls off, the anti-detachment screw is only affected by the force of the rotating shaft moving backward.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. After the anti-slip screw is replaced with an anti-slip baffle, the anti-slip baffle can be designed with a larger size, and will be stronger than the anti-rotation screw under the same material conditions;

[0016] 2. The anti-slip baffle does not contact the end plate. Under normal operating conditions, when the connecting rod and the rotating shaft move, the anti-slip baffle is not affected by the rotating torque. If the rotating shaft falls off, the anti-slip baffle is only affected by the force of the rotating shaft moving backward. The anti-rotation screws in the prior art are affected by the combined effect of the transmission torque and the force of the transmission shaft moving backward. The anti-slip baffle is less stressed and will be more durable than the anti-rotation screws.

[0017] 3. The anti-rotation screws in the prior art are fixed by threads and pre-tightening force, which are easy to loosen or fatigue. The anti-slip baffle is directly welded and fixed on the connecting rod 1, which is more secure.

[0018] 4. When the connecting rod rotates and the rotating shaft moves out of the shaft hole under force, the anti-drop baffle can effectively prevent the rotating shaft from falling off, preventing the fallen parts from falling into the turbine cylinder and steam extraction pipe or causing damage to equipment parts and economic losses, thereby ensuring the safe and stable operation of the turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 This is a cross-sectional view of the connection between the connecting rod 1 and the anti-slip baffle in one embodiment of the utility model;

[0021] Figure 3 It is a partial top view of the connecting rod 1 of the utility model;

[0022] Figure 4 For this utility model Figure 3 Schematic diagram of the structure in a cutaway state;

[0023] Figure 5 A cross-sectional view of the connection between a connecting rod 1 and an anti-slip baffle plate according to another embodiment of the utility model;

[0024] Figure 6 This is a connection diagram of Comparative Example 1.

[0025] In the figure:

[0026] 1. Connecting rod 1; 11. Ring groove; 12. T-shaped groove; 13. Guide prism; 14. Straight groove;

[0027] 2. Connecting rod 2;

[0028] 3. Rotating shaft; 31. End plate;

[0029] 4. Connecting rod three;

[0030] 5. Anti-slip baffle; 51. Connecting part; 52. T-shaped slider; 53. Threaded pressing ring; 54. Connecting bolt; 55. Locking nut;

[0031] 6. Anti-slip screws. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] Example 1

[0034] See also Figures 1 to 4 The utility model provides a technical solution: a device for preventing the rotating shaft of a rotating partition connecting rod of a steam turbine from falling off, comprising:

[0035] The connecting rod 1 is symmetrically concave on both sides and has grooves formed thereon. The connecting rod 2 and the connecting rod 3 4 are horizontally inserted into the grooves at both sides respectively. There are holes through the connecting areas between the connecting rod 1 and the connecting rod 2, and between the connecting rod 1 and the connecting rod 3 4.

[0036] There are two rotating shafts 3, which are respectively passed through the holes at the positions of the connecting rod 1 and the connecting rod 2, and the connecting rod 1 and the connecting rod 3 4 in a centrally symmetrical manner.

[0037] Also includes

[0038] The anti-slip assembly is installed on the connecting rod 1 and the cover is arranged outside the locking end of the rotating shaft 3. The anti-slip assembly is composed of a limiter and a connecting member.

[0039] The limiting member is an anti-slip baffle 5, which has a horizontal portion and a vertical portion, wherein the horizontal portion extends toward the axis of the rotating shaft 3;

[0040] The connecting piece is arranged between the vertical part of the limiting piece and the connecting rod 1, so as to achieve the purpose of firmly connecting the two and quickly separating them.

[0041] In this embodiment, preferably, an end plate 31 is fixed to one end of the rotating shaft 3, and the end plate 31 is a locking end. The diameter of the end plate 31 is larger than the diameter of the rotating shaft 3, and is limitedly fitted with the outer surface of the connecting rod 1.

[0042] In the present embodiment, preferably, an annular groove 11 is provided on the top end surface of the connecting rod 1, and a horizontal connecting portion 51 is also fixed to the bottom end of the vertical portion of the anti-slip baffle 5, and the connecting piece includes a threaded pressure ring 53 built into the annular groove 11, and the bottom end surface of the threaded pressure ring 53 is abutted against the top end surface of the connecting portion 51; a T-shaped slider 52 is also fixed to the bottom end surface of the connecting portion 51, and a T-shaped slot 12 is provided on the bottom end surface of the annular groove 11, and the T-shaped slider 52 slides horizontally in the T-shaped slot 12. When the rotating shaft 3 needs to be installed, the anti-slip baffle 5 is slid horizontally, and the sliding distance is adjusted according to the size of the rotating shaft 3, and the extrusion limitation of the connecting portion 51 and the anti-slip baffle 5 is achieved by rotating the threaded pressure ring 53.

[0043] In this embodiment, preferably, one end of the T-slot 12 extends upward and penetrates the annular groove 11 , and the inner width of the one end is equal to the width of the T-slot slider 52 , thereby facilitating the removal and placement of the T-slot slider 52 .

[0044] In this embodiment, preferably, the inner side surfaces of the horizontal portion and the vertical portion of the anti-slip baffle 5 do not contact the end plate 31, and a gap is reserved between the two.

[0045] Example 2

[0046] See also Figure 1 and Figure 5 The utility model provides a technical solution: a device for preventing the rotating shaft of a rotating partition connecting rod of a steam turbine from falling off, comprising:

[0047] The connecting rod 1 is symmetrically concave on both sides and has grooves formed thereon. The connecting rod 2 and the connecting rod 3 4 are horizontally inserted into the grooves at both sides respectively. There are holes through the connecting areas between the connecting rod 1 and the connecting rod 2, and between the connecting rod 1 and the connecting rod 3 4.

[0048] There are two rotating shafts 3, which are respectively passed through the holes at the positions of the connecting rod 1 and the connecting rod 2, and the connecting rod 1 and the connecting rod 3 4 in a centrally symmetrical manner.

[0049] Also includes

[0050] The anti-slip assembly is installed on the connecting rod 1 and the cover is arranged outside the locking end of the rotating shaft 3. The anti-slip assembly is composed of a limiter and a connecting member.

[0051] The limiting member is an anti-slip baffle 5, which has a horizontal portion and a vertical portion, wherein the horizontal portion extends toward the axis of the rotating shaft 3;

[0052] The connecting piece is arranged between the vertical part of the limiting piece and the connecting rod 1, so as to achieve the purpose of firmly connecting the two and quickly separating them.

[0053] In this embodiment, preferably, an end plate 31 is fixed to one end of the rotating shaft 3, and the end plate 31 is a locking end. The diameter of the end plate 31 is larger than the diameter of the rotating shaft 3, and is limitedly fitted with the outer surface of the connecting rod 1.

[0054] In the present embodiment, preferably, a straight groove 14 is symmetrically provided at the top end of the connecting rod 1 along the rotating shaft 3, a horizontal guide prism 13 is fixed inside the opening at one end of the straight groove 14, a hole is provided on the vertical portion of the anti-detachment baffle 5 for the guide prism 13 to pass through, so as to realize the horizontal movement of the anti-detachment baffle 5 along the guide prism 13, a strip groove is also provided on the guide prism 13, i.e., the H area in the figure, a connecting bolt 54 passes through the inside of the strip groove, the bottom end of the connecting bolt 54 is screwed into the bottom of the anti-detachment baffle 5, and the top of the connecting bolt 54 is sleeved with a locking nut 55, the locking nut 55 is fitted with the top end surface of the guide prism 13, in use, the anti-detachment baffle 5 is limited by tightening the locking nut 55, the anti-detachment baffle 5 is an inverted Z-shape, and a screw hole for the connecting bolt 54 to be screwed into is reserved on the anti-detachment baffle 5

[0055] In the present embodiment, preferably, the inner side surfaces of the horizontal and vertical parts of the anti-detachment baffle 5 do not contact the end plate 31, and a gap is reserved therebetween. Under normal operating conditions, when the connecting rod 1 and the rotating shaft 3 move, the anti-detachment baffle 5 is not affected by the rotational torque. If the rotating shaft 3 falls off, the anti-detachment screw 6 is only affected by the force of the rotating shaft 3 moving backward.

[0056] Comparative Example 1

[0057] See also Figure 6 The end plate 31 is fastened and installed on the connecting rod 1 by means of anti-loosening screws, thereby achieving the purpose of preventing loosening.

[0058] Although the embodiments of the present invention have been shown and described (see the above detailed description for details), it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for preventing the rotating shaft of a rotating diaphragm connecting rod of a steam turbine from falling off, comprising: The connecting rod 1 (1) is symmetrically concave on both sides and has grooves formed thereon. The connecting rod 2 (2) and the connecting rod 3 (4) are horizontally inserted into the grooves at both sides respectively. The connecting areas between the connecting rod 1 (1) and the connecting rod 2 (2) and between the connecting rod 1 (1) and the connecting rod 3 (4) are all penetrated by holes. Two rotating shafts (3) are provided, and respectively penetrate the holes at the positions of the connecting rod 1 (1) and the connecting rod 2 (2), and the connecting rod 1 (1) and the connecting rod 3 (4) in a centrally symmetrical manner. Features: Also includes An anti-slip assembly is installed on the connecting rod (1) and is covered outside the locking end of the rotating shaft (3). The anti-slip assembly is composed of a limiter and a connecting member, wherein The limiting member is an anti-slip baffle (5), and the anti-slip baffle (5) has a horizontal portion and a vertical portion, wherein the horizontal portion extends toward the axis of the rotating shaft (3); The connecting member is arranged between the vertical portion of the limiting member and the connecting rod 1 (1).

2. A device for preventing the rotating shaft of a rotating partition connecting rod of a steam turbine from falling off according to claim 1, characterized in that: An end plate (31) is fixed to one end of the rotating shaft (3). The end plate (31) is a locking end. The diameter of the end plate (31) is larger than the diameter of the rotating shaft (3) and is limitedly fitted with the outer surface of the connecting rod (1).

3. The anti-dropping device for the rotating shaft of the connecting rod of the rotating partition of a steam turbine according to claim 1 is characterized in that: The top end surface of the connecting rod 1 (1) is provided with an annular groove (11), and the bottom end of the vertical portion of the anti-slip baffle (5) is also fixed with a horizontal connecting portion (51), and the connecting member includes a threaded pressure ring (53) built into the annular groove (11), and the bottom end surface of the threaded pressure ring (53) abuts against the top end surface of the connecting portion (51); A T-shaped slider (52) is also fixed to the bottom end surface of the connecting portion (51), and a T-shaped groove (12) is provided on the bottom end surface of the annular groove (11), and the T-shaped slider (52) performs horizontal sliding movement in the T-shaped groove (12).

4. A device for preventing the rotating shaft of a rotating partition connecting rod of a steam turbine from falling off according to claim 3, characterized in that: One end of the T-shaped groove (12) extends upward and is connected to the annular groove (11), and the inner width of the end is equal to the width of the T-shaped sliding block (52).

5. The anti-drop device for rotating shaft of connecting rod of rotating partition of steam turbine according to claim 1, characterized in that: The top end of the connecting rod (1) is symmetrically provided with a straight groove (14) along the rotating shaft (3), and a horizontal guide prism (13) is fixed inside the opening at one end of the straight groove (14). A hole for the guide prism (13) to pass through is provided on the vertical portion of the anti-slip baffle (5), and a strip groove is also provided on the guide prism (13). A connecting bolt (54) passes through the strip groove. The bottom end of the connecting bolt (54) is screwed into the bottom of the anti-slip baffle (5), and the top of the connecting bolt (54) is sleeved with a locking nut (55), and the locking nut (55) is in contact with the top surface of the guide prism (13).

6. A device for preventing the rotating shaft of a rotating partition connecting rod of a steam turbine from falling off according to claim 5, characterized in that: The anti-slip baffle (5) is in an inverted Z shape, and a screw hole for a connecting bolt (54) to be screwed into is reserved on the anti-slip baffle (5).

7. The anti-drop device for the rotating shaft of the connecting rod of the rotating partition of a steam turbine according to claim 2, characterized in that: The inner side surfaces of the horizontal portion and the vertical portion of the anti-slip baffle (5) do not contact the end plate (31), and a gap is reserved between the two.

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