Counterweight-adjustable balance valve

Abstract

An adjustable counterweight type balance valve of a hydrogen-side sealing oil control device in a double-flow ring type hydrogen-cooled generator shaft seal oil supply system can accurately output hydrogen-side sealing oil pressure which is very balanced with air-side sealing oil without adjustment when a gap between a generator rotor shaft diameter and a sealing tile is within a standard range. When the gap between the shaft diameter of the generator rotor and the sealing pad is out of tolerance or other defects occur, hydrogen side sealing oil pressure lower than or higher than the ideal value of air side sealing oil pressure can be conveniently output through external adjustment in the operation process, so that the increase of the string quantity of two paths of sealing oil in the pad caused by the defects of the sealing pad or the shaft diameter is made up.

Description

Technical Field

[0001] The present invention relates to an automatic control device for hydrogen side sealing oil of a hydrogen-cooled generator set shaft sealing oil supply system, in particular to an adjustable counterweight type balancing valve Background Art

[0002] In order to cool the stator coil and rotor coil of the large generator set, the generator is filled with hydrogen with a certain pressure. In order to prevent the hydrogen from overflowing and maintain the purity of the hydrogen, a sealing shoe is set at the end of the generator rotor shaft, and two oil supply systems supply oil to the sealing shoe. Two pressure oil rings around the shaft diameter are established in the sealing shoe to seal the hydrogen in the generator. The pressure oil ring in contact with the air at the outer end is called the air side sealing oil, and the pressure oil ring in contact with the generator hydrogen at the inner end is called the hydrogen side sealing oil. In order to minimize the crosstalk of the two oils in the sealing shoe to ensure that the purity of the hydrogen does not decrease, two high-precision balancing valves are installed in the hydrogen side sealing oil supply system to control the hydrogen side sealing oil pressure of the sealing shoes at the two shaft ends of the generator rotor respectively, so that it tracks and balances with the air side sealing oil pressure. When the gap between the sealing shoe and the generator rotor shaft diameter is qualified, the higher the balancing accuracy of the balancing valve, the less the crosstalk between the hydrogen and air oil rings in the sealing shoe, and the easier it is to ensure the hydrogen purity of the generator. However, when the gap between the generator shaft diameter and the sealing pad increases, or when the sealing pad or shaft diameter has defects due to wear, the crosstalk will increase accordingly. At this time, the output oil pressure of the balancing valve needs to be adjusted to a deviation to compensate for the increase in the crosstalk of the sealing oil on the hydrogen and air sides caused by defects in the sealing pad or shaft diameter. Summary of the invention

[0003] The purpose of the present invention is to enable the balancing valve to accurately balance the sealing oil pressures on both sides of the hydrogen and air when the gap between the generator shaft diameter and the sealing shoe is qualified. At the same time, when the gap between the generator shaft diameter and the sealing shoe is out of tolerance or defects occur, the balancing valve can also be adjusted to make the hydrogen side sealing oil lower or higher than the air side sealing oil pressure by a certain value to reduce the amount of oil crosstalk between the two routes. The present invention redesigns the counterweight balancing valve invented earlier by one of the inventors to make it a new adjustable counterweight balancing valve.

[0004] The present invention is realized in the following manner: an adjustable counterweight balancing valve comprises a valve cover 1, an adjusting rod 33, a sliding sleeve 2, a push head 26, a spring pressure cover 4, a spring 5, a piston 8, a valve core 19, a piston chamber 7, a valve seat body 11, a lever 36, and a counterweight block 35. The valve cover 1, the sliding sleeve 2, the spring pressure cover 4, the spring 5, the push head 26, the limit ring 27, and the adjusting rod 33 constitute a balancing adjustment device, the rotating adjusting rod 33 sliding sleeve slides up and down under the control of the limit block 28 on the limit ring 27, and the spring 5 (such as the push head 26 and the spring pressure cover 4 are pressed or loosened) is pressed or loosened by the push head 26 and the spring pressure cover 4. Figure 1As shown). A hydrogen side feedback oil pipe 41 is provided on one side of the valve cover 1 and communicates with the upper part of the piston chamber 7 through the first connecting hole 42. The valve body located under the valve cover is composed of an upper and lower part, the upper part is the piston chamber 7, and the lower part is a square tetrahedron valve seat body 11. The piston chamber 7 is equipped with a piston 8. The spring 5 is pressed on the bottom plane of the piston inner chamber 9 and is limited by the spring limit seat 24. The piston 8 is made into one piece with the valve core 19 and the push rod 18 and has the same axis. The valve core 19 is dynamically matched with the inner hole of the valve sleeve 21 embedded in the valve seat body 11. The valve sleeve 21 is provided with two long holes 20 parallel to the axis and symmetrical to the axis at the oil inlet chamber 12, which connect the oil inlet chamber 12 and the oil outlet chamber 15. When the valve core descends with the piston, the passage between the oil inlet chamber 12 and the oil outlet chamber 15 is gradually cut off, and vice versa, it is gradually opened. The oil inlet chamber 12 is communicated with the inclined hole 13 and the oil inlet hole 14 in turn, and the oil outlet chamber 15 is communicated with the oil outlet hole 17 (as shown in FIG. Figure 1 As shown in FIG. 1 , a bottom plate 16 is provided at the bottom of the oil outlet chamber, and a lever-type counterweight is also provided on one side of the valve seat body 11. The lever 36 uses the shaft 37 installed on the bracket 38 as a fulcrum, and a counterweight block 35 is inlaid on one end. The spherical arc end 43 at the other end abuts against the lower end plane of the push rod 18. An air-side feedback oil pipe 39 is provided on the other plane of the valve seat body opposite to the lever-type counterweight and communicates with the annular sedimentation groove 22 through the second connecting hole 40 (as shown in FIG. 1 ). Figure 2 shown).

[0005] The specific working principle is as follows: the oil inlet hole 14 is connected to the hydrogen side sealing oil pump outlet, the oil outlet hole 17 is connected to the sealing shoe hydrogen side sealing oil pipeline, the hydrogen side feedback oil pipe 41 is connected to the sealing shoe hydrogen side feedback oil pressure, and the air side feedback oil pipe 39 is connected to the sealing shoe air side feedback oil pressure. When the adjustable counterweight balancing valve is put into operation, the sealing shoe feedback signal from the air side acts on the lower end surface of the piston 8 through the air side feedback oil pipe 39, the second connecting hole 40, the annular sedimentation groove 22, and the gap 10 to push the piston and drive the valve core 19 to move, the long hole 20 is gradually opened, and the oil pressure from the hydrogen side oil pump outlet is transmitted through the oil inlet hole 14, the inclined hole 13, the oil inlet chamber 12, and the long hole 20. , oil outlet chamber 15, and oil outlet hole 17 supply oil to the hydrogen side oil ring of the sealing shoe, forming hydrogen side sealing oil pressure in the sealing shoe and taking out feedback oil signal through hydrogen side feedback oil pipe 41 and the first connecting hole 42 to enter the upper end of the piston chamber to control the movement of the piston 8. When the hydrogen side sealing oil pressure in the sealing shoe and the air side sealing oil pressure are balanced, the pressures at the upper and lower ends of the piston 8 are also balanced, the piston stops moving, and the oil pressure output by the balancing valve is controlled. Since the weight of the piston 8 and the valve core 19 is completely overcome by the lever-type counterweight, there is no need to consider the influence of the weight of the piston and the valve core on the balancing accuracy at this time. The oil pressure output by the balancing valve is completely balanced with the air side sealing oil pressure (as shown in the attached figure). Figure 2As shown), this is the required operating state when the gap between the sealing shoe and the generator rotor shaft diameter is qualified. When the gap between the sealing shoe and the shaft diameter increases, the amount of sealing oil on both the hydrogen and air sides will increase. Generally, the hydrogen side sealing oil has less oil leakage due to the hydrogen pressure blocking, while the air side is in contact with the atmosphere and has a relatively large oil leakage, so it is basically the hydrogen side sealing oil that flows to the air side. Based on this feature, the present invention places a precisely calculated spring on the upper end of the piston 8, and an adjustment mechanism adjusts the spring pressure externally. When the gap between the sealing shoe increases and the amount of hydrogen and air on both sides increases, the adjustment rod 33 can be rotated to make the sleeve 2 slide downward through the push head 26 and the spring pressure cover 4 to compress the spring 5, so that the pressure output by the balance valve is less than an ideal value of the air side sealing oil to reduce the amount of hydrogen and air on both sides in the sealing shoe. When the sealing shoe gap is normal and the spring is not expected to be involved in the adjustment, the spring can be completely relaxed by rotating the adjusting rod. At this time, since the same height space is reserved between the annular top of the spring gland 4 and the upper end surface of the spring chamber 6 and the bottom of the spring gland push head hole 25 and the push head 26, when the spring is completely relaxed, the up and down movement of the piston will not compress the spring (such as the attached Figure 1 , 2 shown). BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 The main view of the adjustable counterweight balancing valve

[0007] Figure 2 Left view of adjustable counterweight balancing valve

[0008] The serial numbers are: 1 valve cover, 2 sliding sleeve, 3 space, 4 spring pressure cover, 5 spring, 6 spring chamber, 7 piston chamber, 8 piston, 9 piston inner chamber, 10 gap, 11 valve seat body, 12 oil inlet chamber, 13 inclined hole, 14 oil inlet hole, 15 oil outlet chamber, 16 bottom plate, 17 oil outlet hole, 18 push rod, 19 valve core, 20 long hole, 21 valve sleeve, 22 annular sedimentation groove, 23 platform, 24 spring limit seat, 25 push head hole, 26 push head, 27 limit ring, 28 limit block, 29 valve cover inner hole, 30 limit groove, 31 external thread, 32 circular boss, 33 adjustment rod, 34 sealing cover, 35 counterweight, 36 lever, 37 shaft, 38 bracket, 39 air side feedback oil pipe, 40 second connecting hole, 41 hydrogen side feedback oil pipe, 42 first connecting hole, 43 spherical arc surface end. DETAILED DESCRIPTION

[0009] like Figure 1-2As shown, an adjustable counterweight balancing valve includes a valve cover 1, a sliding sleeve 2, an adjusting rod 33, a push head 26, a spring pressure cover 4, a spring 5, a piston 8, a valve core 19, a piston chamber 7, a valve seat body 11, a counterweight block 35, and a lever 36. It is characterized in that a precisely calculated spring 5 is placed on the upper end of the piston 8 and is limited by a spring limit seat 24 to prevent the spring from moving laterally. The upper half of the spring 5 is placed in the spring chamber 6 of the valve cover 1. The spring adjustment mechanism is composed of an adjusting rod 33, a sliding sleeve 2, a push head 26, a spring pressure cover 4 and other components. In order to facilitate adjustment, the upper end of the adjusting rod 33 is The half part extends out of the valve cover. In the middle of the adjusting rod 33 is a circular boss 32 which is stuck at the top of the inner hole of the valve cover to limit the length of the adjusting rod. Below the circular boss 32 is an external thread 31 which cooperates with the internal thread of the sliding sleeve 2. The outer surface of the cylindrical sliding sleeve 2 is processed with symmetrical and vertically penetrating limit grooves 30. The inner hole of the limit ring 27 fixed on the upper end surface of the spring chamber is inlaid with two symmetrical limit blocks 28 which cooperate with the limit grooves 30 of the sliding sleeve. When the adjusting rod 33 is rotated, the sliding sleeve 2 can only slide up and down under the action of the limit blocks 28 and adjust the spring pressure through the push head 26 and the spring pressure cover 4 (as shown in the attached figure). Figure 1 , 2 As shown). A hydrogen side feedback oil pipe 41 is also provided on the valve cover and communicates with the upper part of the piston chamber through the first connecting hole 42. The valve body is composed of two parts: the piston chamber 7 and the valve seat body 11. The piston chamber 7 is equipped with a piston 8. The bottom plane of the inner hole of the piston 8 is processed with an annular spring limit seat 24 around the axis. In order to leave a certain gap between the lower end face of the piston and the bottom face of the piston chamber when the piston falls so as to establish the air side feedback oil pressure, a circular platform 23 is provided in the middle of the lower end face of the piston, and the valve core 19 and the push rod 18 are arranged below the circular platform 23 in sequence; in order to facilitate sealing and installation of the lever-type counterweight, the outer surface of the valve seat body 11 is made into a square tetrahedron, and the two opposite sides of the tetrahedron are respectively provided with an oil inlet hole 14 and an oil outlet hole 17, and the other side is provided with a lever-type counterweight and is sealed by a sealing cover 34, and the lever 36 is installed on the bracket 38 with a shaft 37 is a fulcrum, one end of which is inlaid with a counterweight 35, and the other end of the spherical arc surface is against the lower end plane of the push rod 18. There is also a plane outside the valve body with an air side feedback oil pipe 39, which is connected to the annular sedimentation groove 22 through the second connecting hole 40. The function of the annular sedimentation groove is to deposit impurities in the air side feedback oil and store them in the groove to prevent the valve core and the piston from getting stuck. A valve sleeve 21 is provided in the middle of the valve seat body 11. The inner hole of the valve sleeve passes through the piston chamber 7 and the oil outlet chamber 15. Two symmetrical long holes 20 are opened in the middle of the oil inlet chamber. The valve core 19 is dynamically matched with the inner hole of the valve sleeve 21. The valve core 19 moves up and down under the drive of the piston 8 to adjust the opening of the long hole 20 to control the oil pressure at the outlet of the balance valve.

Claims

1. An adjustable counterweight balancing valve, comprising a valve cover (1), a sliding sleeve (2), an adjusting rod (33), a push head (26), a spring gland (4), a spring (5), a piston (8), a valve core (19), a piston chamber (7), a valve seat body (11), a lever (36), and a counterweight (35), wherein: A balancing adjustment device is composed of a valve cover (1), a sliding sleeve (2), a spring pressure cover (4), a spring (5), a push head (26), a limit ring (27), and an adjustment rod (33). A hydrogen side feedback oil pipe (41) is provided on one side of the valve cover and communicates with the upper part of a piston chamber (7) through a first connecting hole (42). The valve body located below the valve cover is composed of an upper and lower part, the upper part is the piston chamber (7), and the lower part is a square tetrahedral valve seat body (11). A piston (8) is arranged in the piston chamber (7). The spring (5) is placed on the bottom plane of the piston inner chamber (9) and is limited by a spring limit seat (24). The piston (8) is made into one piece with a valve core (19) and a push rod (18) and has the same axis. The valve core (19) is dynamically matched with the inner hole of a valve sleeve (21) embedded in the valve seat body (11). The valve sleeve (21) is provided with two symmetrical long holes parallel to the axis at the oil inlet chamber (12). (20), the long hole (20) communicates with the oil inlet chamber (12) and the oil outlet chamber (15), when the valve core (19) descends with the piston (8), the passage between the oil inlet chamber (12) and the oil outlet chamber (15) is gradually cut off, and vice versa, the passage is gradually opened, the oil inlet chamber (12) is communicated with the inclined hole (13) and the oil inlet hole (14) in sequence, and the oil outlet chamber (15) is communicated with the oil outlet hole (17), and the bottom of the oil outlet chamber of the valve seat body (11) is provided with a bottom plate (16) ), a lever-type counterweight is also provided on one side plane of the valve seat body (11), the lever (36) uses the shaft (37) mounted on the bracket (38) as a fulcrum, one end of the lever (36) is inlaid with a counterweight block (35), and the other end of the spherical arc end (43) is against the lower end plane of the push rod (18), and the other plane of the valve seat body corresponding to the lever-type counterweight is provided with an air-side feedback oil pipe (39) and communicates with the annular sedimentation groove (22) through a second connecting hole (40).

2. The adjustable counterweight balancing valve according to claim 1 is characterized in that: The valve cover (1) constituting the essential element of the balance adjustment device is provided with a spring chamber (6) and a valve cover inner hole (29) inside. After being assembled with the valve body, the axis of the valve cover coincides with the extended axis of the piston and the valve core. The upper half of the spring (5) placed on the bottom plane of the piston inner chamber (9) is placed in the spring chamber (6). The annular upper end of the spring pressure cover (4) is pressed on the upper end of the spring (5). When the spring is at a free height, a space (3) designed according to needs is reserved between the top of the annular upper end of the spring pressure cover (4) and the upper end surface of the spring chamber (6). The height of the space is equal to the distance between the bottom of the spring pressure cover push head hole (25) and the push head (26).

3. The adjustable counterweight balancing valve according to claim 1 and claim 2 is characterized in that: The upper part of the adjusting rod (33) is designed as a smooth cylinder with a taper at the head, extending outside the valve cover, and a circular boss (32) is formed in the middle to limit the length of the adjusting rod extending outside the valve cover. The lower part is an external thread (31) that matches with the internal thread of the sliding sleeve (2). The cylindrical outer surface of the sliding sleeve (2) is dynamically matched with the inner hole (29) of the valve cover. At the same time, the outer surface of the sliding sleeve (2) is also provided with two vertically penetrating limit grooves (30) that are 180° symmetrical and parallel to the axis. The limit grooves (30) are fixed on the top of the spring chamber (6) to form a spring groove. The sliding sleeve (2) is provided with a push head (26) at the lower end thereof, and the push head (26) is inserted into a push head hole (25) in the middle of the spring pressure cover, and a space equal to the height of the space (3) is left at the bottom of the push head hole. The adjusting rod (33) is rotated, and the sliding sleeve (2) can only move up and down under the action of the limit blocks (28), and drives the push head (26) embedded in the bottom of the sliding sleeve (2) to push the spring pressure cover (4) to compress or release the spring (5).

4. The adjustable counterweight balancing valve according to claim 1 is characterized in that: The outer circumferential surface of the cylindrical piston (8) is processed with a plurality of annular closed grooves, the bottom plane of the piston inner chamber (9) is provided with an annular spring limit seat (24) surrounding the axis, a circular platform (23) is processed in the middle of the lower end surface of the piston, and a cylindrical valve core (19) and a cylindrical push rod (18) which are integrally formed with the piston and have the same axis are sequentially arranged below the platform, and the circumferential surface of the valve core is processed with a plurality of annular closed grooves.

5. The adjustable counterweight balancing valve according to claim 1 is characterized in that: The upper half of the valve body is a cylindrical piston chamber (7), and the bottom plane of the piston chamber (7) is provided with an annular sedimentation groove (22). The lower half is a square tetrahedral valve seat body (11), and a valve sleeve (21) is inlaid in the middle of the valve seat body. The inner hole of the valve sleeve (21) passes through the piston chamber (7) and the oil outlet chamber (15). The valve core (19) and the inner hole of the valve sleeve (21) are in dynamic cooperation. Two symmetrical planes outside the valve seat body (11) are respectively provided with an oil inlet hole (14) and an oil outlet hole (17). The oil inlet hole (14) is connected to the oil outlet hole (17) through an inclined hole (13), an oil inlet chamber (12), a long hole (20) of the valve sleeve, and the oil outlet chamber (15) in sequence. A plane adjacent to the oil inlet and oil outlet holes is provided with a lever-type counterweight and a sealing cover (34), and a plane opposite to the plane is provided with an air side feedback oil pipe (39) and communicates with the annular sedimentation groove (22) through a second connecting hole (40).

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