Sealing surface two-stage adjusting sealing device

Abstract

The invention discloses a sealing surface two-stage adjusting sealing device. The lower support is placed on the upper edge of the circular base, and the lower support and the circular base are connected and fixed through a fastening screw and are sealed through a sealing ring. The upper portion of the lower support and the top cover are fixed through fastening screws, and the lower support and the top cover are sealed through a sealing ring. A lower sealing gasket and an upper sealing gasket are fixed to the surfaces of the inner sides of the lower support and the top cover, and the lower support and the sealing gaskets are provided with evenly-distributed groove sliding grooves. A split type large sealing ring support is placed above the lower sealing gasket, protruding sliding rails are evenly distributed on the outer side of the split type large sealing ring support, and the sliding rails correspond to the grooves. The upper portion of the split type large sealing ring support and the split type large sealing ring upper cover are positioned through a positioning pin (the support corresponds to the upper cover in a one-to-one mode). And the upper cover and the top cover of the split type large sealing ring are sealed through an upper sealing gasket. The sealing effect is guaranteed, frictional wear can be reduced, and the service life is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of oil mist sealing of a bearing cavity of a main shaft of a water turbine, and in particular relates to a sealing surface double-stage regulating sealing device. Background Art

[0002] A water turbine is a power machine that converts the energy of water flow into rotational mechanical energy. It belongs to the turbine machinery in fluid machinery. Most modern water turbines are installed in hydropower stations to drive generators to generate electricity. In a hydropower station, water from the upstream reservoir is led to the water turbine through a water diversion pipe, which drives the turbine runner to rotate and drives the generator to generate electricity. The main function of the turbine thrust bearing is to bear the weight of the rotating part of the entire turbine generator set and the axial water thrust of the turbine, and transmit these forces to the load frame (lower frame) and foundation concrete of the turbine generator. During the process of the turbine set carrying load, the main shaft will have axial stringing and circumferential swing. With the increase of running time, the wear of the sealing surface will increase, especially under the dual effects of the up and down movement and swing of the main shaft during the start-stop process, resulting in the appearance and increase of the sealing gap, which causes the seal to fail and oil mist to leak. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a sealing surface double-stage adjustment sealing device which prolongs the service life and improves the sealing effect.

[0004] The lower support is placed on the circular base, the two are connected and fixed by fastening screws, and the two are sealed by a sealing ring. The upper part of the lower support is fixed to the top cover by fastening screws, and the two are sealed by a sealing ring.

[0005] The lower support and the inner surface of the top cover are fixed with a lower sealing gasket and an upper sealing gasket, and the lower support and the sealing gasket are provided with evenly distributed grooves for sliding. A split-flap large sealing ring support is placed above the lower sealing gasket, and the outer side of the split-flap large sealing ring support is provided with evenly distributed protruding slide rails, and the slide rails correspond to the grooves. The top of the split-flap large sealing ring support and the split-flap large sealing ring upper cover are positioned by positioning pins (the support and the upper cover correspond one to one). The split-flap large sealing ring upper cover and the top cover are sealed by the upper sealing gasket.

[0006] The outer power ring is placed on the inner side of the lower support and the top cover, as well as on the outer side of the split large sealing ring support and the split large sealing ring upper cover. The outer power ring controls the contraction and expansion of the split large sealing ring support and the split large sealing ring upper cover through internal pressurization and decompression.

[0007] The petal-type lower sealing ring and the petal-type upper sealing ring are in contact with the petal-type large sealing ring support and the petal-type large sealing ring upper cover respectively, and the inner side contacts the main shaft to form a sealing surface to prevent gas and liquid leakage, and the outer side contacts the inner power ring. The petal-type lower sealing ring and the petal-type upper sealing ring are connected by elastic support.

[0008] The inner power ring is placed inside the large split sealing ring support and the upper cover of the large split sealing ring. The inner power ring controls the contraction and expansion of the lower split sealing ring and the upper split sealing ring by internal pressurization and decompression.

[0009] The technical effects of the present invention are as follows:

[0010] 1. The existing seals are mainly compensated by springs or springs, which may fail or reduce their elasticity, thereby reducing the sealing effect. The present invention can automatically adjust the wear amount of the sealing surface of the sealing ring according to needs, thereby ensuring the sealing effect and reducing friction and wear to extend the service life.

[0011] 2. The sealing gap of the existing seal is mainly compensated by springs or springs, and the pressing force of the sealing surface is fixed and cannot change with the swing of the main shaft; the present invention can automatically increase the contact force between the sealing ring and the main shaft under large swing conditions, thereby improving the follow-up performance of the sealing surface with the swing of the main shaft, reducing the appearance of sealing gaps, and improving the sealing effect.

[0012] 3. The existing seals are mainly compensated by springs or spring clips, and the compensation amount is limited, which cannot meet the needs well under long-term and heavy wear conditions. The two-stage adjustment of the present invention can improve the sealing accuracy of the sealing surface, and can also compensate for the large wear of the sealing surface, thereby ensuring the use of the seal under long-term and heavy wear conditions.

[0013] 4. The existing sealing space is mainly suitable for sealing with a fixed diameter; the present invention can adapt to the working condition where the diameter of the rotating shaft gradually changes, and can adjust the sealing surface as the diameter of the main shaft changes, thereby ensuring the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a cross-sectional view of the structure of the double-stage regulating sealing device on the sealing surface.

[0015] Figure 2 This is the control system diagram of the sealing surface double-stage adjustment sealing device

[0016] 101 base; 102 lower support; 103 outer power ring; 104 top cover; 105 automatic valve 1; 106 automatic valve 2; 107 gas storage tank; 108 high pressure flow medium source; 109 automatic valve 3; 110 gas storage tank pressure sensor; 111 automatic valve 4; 112 automatic valve 5; 113 automatic valve 6; 114 elastic bellows; 115 internal pressure sensor of inner power ring; 116 petal-type large sealing ring upper cover; 117 petal-type upper sealing ring; 118 petal-type lower sealing ring; 119 petal-type large sealing ring support; 120 inner power ring; 121 internal pressure sensor of outer power ring; 122 elastic support; 123 lower sealing gasket; 124 positioning pin; 125 fastening screw 1; 126 sealing ring; 127 fastening screw 2; 128 upper sealing gasket, 10 gas tank internal pressure signal identification unit; 20 outer power ring internal pressure signal identification unit; 30 inner power ring internal pressure signal identification unit; 60 high pressure source drive control component; 70 automatic valve drive control component; 71 time-sharing starter 1; 72 time-sharing starter 2; 73 time-sharing starter 3; 108 high pressure flow medium source; 105 automatic valve 1; 106 automatic valve 2; 109 automatic valve 3; 111 automatic valve 4; 112 automatic valve 5; 113 automatic valve 6 DETAILED DESCRIPTION

[0017] The shape and structural features of the technical solution of the present invention are shown in the figure, which is a sealing surface two-stage adjustment sealing device and system, including a sealing surface two-stage adjustment sealing device 100 and a two-stage adjustment sealing system.

[0018] The sealing components of the whole device of the present invention are mainly upper and lower sealing rings and a large sealing ring support to form a two-stage adjustable sealing surface. The high-pressure medium enters the inner and outer power rings through the pipeline, and the sealing rings are tightly attached to the main shaft through the expansion of the gas to prevent the leakage of oil and gas medium. The internal pressure of the inner and outer power rings is controlled by an automatic valve to adjust the size of the pressing force of the sealing surface, so that the sealing ring can follow the swing of the main shaft to achieve the sealing function, which solves the problem of oil and gas leakage caused by the gap generated by the swing of the seal.

[0019] The two-stage regulating sealing system includes 10 an internal pressure signal identification unit of the gas storage tank; 20 an internal pressure signal identification unit of the outer power ring; 30 an internal pressure signal identification unit of the inner power ring; 60 a high-pressure source drive control component; 70 an automatic valve drive control component; 71 a time-sharing starter 1; 72 a time-sharing starter 2; 73 a time-sharing starter 3; 108 a high-pressure flow medium source; 105 an automatic valve 1; 106 an automatic valve 2; 109 an automatic valve 3; 111 an automatic valve 4; 112 an automatic valve 5; 113 an automatic valve 6 and a signal line. In the whole system, the sealing device, the controller, the drive control component and the signal identification unit are electrically connected through the signal line to form a plurality of feedback control connections. According to the filling and discharge of the high-pressure medium in the inner and outer power rings in the signal control device, the functions of automatic compensation after the friction and wear of the seal and automatic adaptation to the spindle runout seal are realized.

[0020] Function and working principle of the present invention

[0021] This example is a sealing surface double-stage regulating sealing device and system. The outer power circle internal pressure signal identification unit 20 and the inner power circle internal pressure signal identification unit 30 are respectively connected to the automatic valve 1, automatic valve 2 and automatic valve 5, automatic valve 6 to identify the internal pressure signals of the inner and outer power circles of the unit signal. When the sealing equipment is installed and started, the internal pressure signals of the inner and outer power circles are transmitted to the automatic valve drive control component 70, and the automatic valves 106, 112, 111 are opened through the time-sharing starters 71, 72, 73 to supplement the pressure inside the inner and outer power circles to the set pressure, and then the automatic valves 106, 112, 111 are closed. The normal sealing of the sealing surface is guaranteed, and the invented device can operate normally.

[0022] After running for a period of time, when the pressure of the outer power circle is less than the set value, the pressure signal inside the outer power circle is transmitted to the automatic valve drive control component 70, and the automatic valves 106 and 111 are opened through the time-sharing starters 71 and 73 to replenish the pressure inside the outer power circle to the set pressure, and then the automatic valves 106 and 111 are closed. The normal sealing of the sealing surface is guaranteed, and the device of the invention can operate normally.

[0023] When the internal pressure of the inner and outer power rings is less than the set value, the internal pressure signal of the power ring is transmitted to the automatic valve drive control component 70, and the automatic valves 106 and 111 are opened through the time-sharing starters 71 and 73 to replenish the pressure inside the outer power ring to the set pressure, and then the automatic valves 106 and 111 are closed. The normal sealing of the sealing surface is guaranteed, and the device of the invention can operate normally.

[0024] When the internal pressure of the outer power circle is higher than the set value and the internal pressure of the inner power circle remains unchanged, the internal pressure signals of the inner and outer power circles are transmitted to the automatic valve drive control component 70, and the automatic valves 112 and 111 are opened through the time-sharing starters 71 and 72 to replenish the internal pressure of the inner and outer power circles to the set pressure, and then the automatic valves 112 and 111 are closed, so as to ensure that the device of the present invention can operate normally.

[0025] The gas tank internal pressure signal identification unit 10 identifies the pressure inside the gas tank. When the pressure is lower than the set lower limit, the signal is transmitted to the high-pressure source drive control component 60 and the automatic valve drive control component 70, and the high-pressure source and the automatic valve 109 are opened by controlling the time-sharing starters 61 and 71 to inflate the gas tank. When the pressure is higher than the set upper limit, the signal is transmitted to the high-pressure source drive control component 60 and the automatic valve drive control component 70, and the high-pressure source and the automatic valve 109 are closed by controlling the time-sharing starters 61 and 71 to stop inflation.

[0026] When the pressure inside the inner and outer power rings fluctuates greatly, the pressure signals inside the inner and outer power rings are transmitted to the automatic valve drive control component 70, and the automatic valves 106, 112, 113, 111 are opened through the time-sharing starters 71, 72, 73 to replenish the pressure inside the inner and outer power rings to 1.2 times the set pressure, and then the automatic valves 106, 112, 111 are closed. The normal sealing of the sealing surface is guaranteed, and the device of the invention can operate normally.

[0027] When the internal pressure of the inner and outer power rings is higher than the set value, the internal pressure signal of the inner and outer power rings is transmitted to the automatic valve drive control component 70, and the automatic valves 105 and 113 are opened through the time-sharing starters 71 and 72 to release the pressure inside the inner and outer power rings to the set pressure, and then the automatic valves 105 and 113 are closed. The normal sealing of the sealing surface is guaranteed, and the device of the invention can operate normally.

Claims

1. A sealing surface double-stage regulating sealing device, characterized in that: The lower support is placed on the top of the circular base, and the two are sealed together. The top of the lower support is sealed together with the top cover. The lower sealing gasket and the upper sealing gasket are fixed on the inner surfaces of the lower support and the top cover. The lower support and the sealing gasket are provided with evenly distributed groove sliding grooves. A large petal-type sealing ring support is placed above the lower sealing gasket. The outer side of the large petal-type sealing ring support is provided with evenly distributed protruding sliding rails, and the sliding rails correspond to the grooves. The outer power ring is placed on the inner side of the lower support and the top cover, as well as on the outer side of the large petal-type sealing ring support and the upper cover of the large petal-type sealing ring, and the inner power ring is placed on the inner side of the large petal-type sealing ring support and the upper cover of the large petal-type sealing ring.

2. The sealing surface double-stage regulating sealing device according to claim 1, characterized in that: The lower support and the circular base are fixedly connected by fastening screws.

3. The sealing surface double-stage regulating sealing device according to claim 1, characterized in that: The upper part of the lower support is fixed to the top cover by fastening screws, and the two are sealed by a sealing ring.

4. The sealing surface double-stage regulating sealing device according to claim 1, characterized in that: The upper part of the split-flap large sealing ring support and the split-flap large sealing ring upper cover are positioned by positioning pins.

5. The sealing surface double-stage regulating sealing device according to claim 1, characterized in that: The outer power ring controls the contraction and expansion of the split-type large sealing ring support and the split-type large sealing ring upper cover by internal pressurization and decompression.

6. The sealing surface double-stage regulating sealing device according to claim 1, characterized in that: The upper part of the split-type large sealing ring support is positioned with the split-type large sealing ring upper cover, and the split-type large sealing ring upper cover is sealingly connected with the top cover.

7. The sealing surface double-stage regulating sealing device according to claim 1, characterized in that: The inner power ring controls the contraction and expansion of the split-type lower sealing ring and the split-type upper sealing ring by internal pressurization and decompression.

8. The sealing surface double-stage regulating sealing device according to claim 1, characterized in that: The petal-type lower sealing ring and the petal-type upper sealing ring are in contact with the petal-type large sealing ring support and the petal-type large sealing ring upper cover respectively, the inner side is in contact with the main shaft to form a sealing surface to prevent gas and liquid leakage, and the outer side is in contact with the inner power circle.

9. The sealing surface double-stage regulating sealing device according to claim 1, characterized in that: The petal-type lower sealing ring and the petal-type upper sealing ring are connected via elastic support.

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