Multi-stage mechanical sealing device

Abstract

The utility model provides a multistage mechanical sealing device which comprises a sealing body arranged outside an oil groove, at least one oil mist absorption chamber is formed in the position, surrounding the periphery of a rotating shaft, of the sealing body, the at least one oil mist absorption chamber is communicated to a condensation cylinder through an oil mist absorption pipeline, and the condensation cylinder is further connected with a negative pressure device. A plurality of condensation fins which are oppositely inserted up and down are arranged in the condensation cylinder, the condensation fins are made of a material with good heat-conducting property, and a gap for oil mist to pass through is reserved between every two adjacent condensation fins; an oil return groove is formed in the bottom of the condensation cylinder and communicates with the outside of the condensation cylinder through the oil discharge outlet. As the upper and lower rows of condensation fins adopt a staggered and overlapped structure, the flow speed of an oil mist channel is reduced, the scouring force of oil mist to gas film layers on the surfaces of the condensation fins is weakened, the oil mist in the channel is more frequently shunted, the gas film layers on the surfaces of the condensation fins are continuously damaged, the inhibition effect on the formation of the gas film layers is stronger, and the flow resistance is increased; and the oil mist can be quickly liquefied and collected.

Description

Technical Field

[0001] The utility model relates to a multi-stage mechanical sealing device, which is mainly used for sealing the bearing oil groove of a large generator set. Background Art

[0002] At present, in terms of the oil mist absorption technology for the bearing oil tank of the hydro-turbine generator set, an oil mist absorption device interface is generally provided on the upper part of the oil tank, and a pipeline is connected to the oil mist absorption device outside the machine pit. The oil mist absorption device has an appropriate negative pressure, which can absorb and filter the oil mist in the oil tank. The clean air after filtration will be discharged back into the atmosphere, and the condensed oil will flow back to the oil tank. However, improper arrangement, density or material selection of the filter element fiber, unreasonable design of the filter element support structure or poor material may cause the filter element to deform or be damaged during use, thereby affecting the filtering effect. Utility Model Content

[0003] The utility model aims to provide a multi-stage mechanical sealing device to solve the problem of poor filter element structure in the prior art.

[0004] A multi-stage mechanical seal device comprises a seal body arranged outside an oil groove, wherein the seal body forms at least one oil mist absorption chamber at a position surrounding the circumference of a rotating shaft, and is characterized in that:

[0005] At least one of the oil mist absorption chambers is connected to a condensation cylinder through an oil mist absorption pipeline, and the condensation cylinder is also connected to a negative pressure device;

[0006] The condenser cylinder is provided with a plurality of condenser fins inserted in an upward and downward relationship. The condenser fins are made of a material with good thermal conductivity, and gaps are left between adjacent condenser fins for oil mist to pass through.

[0007] An oil return groove is provided at the bottom of the condenser cylinder, and the oil return groove is connected to the outside of the condenser cylinder through the oil discharge port.

[0008] The multi-stage mechanical sealing device, wherein: the sealing body forms two oil mist absorption chambers, an upper chamber and a lower chamber, and the oil mist absorption pipeline is connected to the lower chamber.

[0009] The multi-stage mechanical sealing device, wherein: the condensing fin is thicker on the outside and thinner in the middle.

[0010] The multi-stage mechanical sealing device, wherein: the condensing fins are heat-transfer connected to an electric refrigerator, and the electric refrigerator is connected to a battery.

[0011] The multi-stage mechanical sealing device, wherein: the electric refrigerator is arranged inside the condensing fin.

[0012] The multi-stage mechanical sealing device, wherein: a liquid crystal display screen is provided on the outside of the condensing cylinder, a power sensor is connected to the condensing wing, and the power sensor signal is connected to the liquid crystal display screen.

[0013] The advantages of the utility model are: the upper and lower rows of condensing fins adopt a staggered overlapping structure, which reduces the flow velocity of the oil mist channel, weakens the scouring force of the oil mist on the air film layer on the surface of the condensing fin, and the oil mist in the channel is more frequently diverted, so that the air film layer on the surface of the condensing fin is continuously destroyed, the formation of the air film layer is more strongly inhibited, the flow resistance is increased, and the oil mist can be quickly liquefied and collected. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a multi-stage mechanical sealing device.

[0015] Explanation of reference numerals: oil tank 1; sealing body 2; rotating shaft 3; oil mist absorption chamber 4; oil mist absorption pipeline 5; condensing cylinder 6; condensing fin 7; oil return groove 8; oil drain port 9; liquid crystal display screen 10; battery 11. DETAILED DESCRIPTION

[0016] like Figure 1 As shown, the utility model provides a multi-stage mechanical sealing device, comprising a sealing body 2 arranged outside an oil tank 1, wherein the sealing body 2 forms at least one oil mist absorption chamber 4 at a position surrounding the circumference of a rotating shaft 3, and after the oil mist overflowing upward from the oil tank 1 along the rotating shaft 3 enters the oil mist absorption chamber 4, it can be removed through the oil mist absorption pipeline 5 under the action of negative pressure;

[0017] In this embodiment, the sealing body 2 forms two oil mist absorption chambers 4, an upper chamber and a lower chamber, and the oil mist absorption pipeline 5 is connected to the lower chamber;

[0018] In the utility model, the downstream of the oil mist suction pipeline 5 is connected to the condensing cylinder 6, and a plurality of condensing wings 7 are arranged in the condensing cylinder 6, which are inserted relatively up and down. The condensing wings 7 are made of a material with good thermal conductivity (such as a metal material) and have a large surface area to increase the contact area with the oil mist; an oil return groove 8 is provided at the bottom of the condensing cylinder 6, and the oil return groove 8 is collected to the oil discharge port 9, and the oil discharge port 9 is connected to the outside of the condensing cylinder 6;

[0019] The condensing fins 7 are thicker on the outside and thinner in the middle, so that the multiple condensing fins 7 inserted relatively up and down are arranged more closely (still leaving gaps for oil mist to pass through);

[0020] The condensing fin 7 is heat-conductingly connected to an electric refrigerator (for example, an electric refrigerator is provided inside the condensing fin 7), and the electric refrigerator is connected to the battery 11 outside the condensing cylinder 6, so that the surface of the condensing fin 7 has a lower temperature; of course, the condensing fin 7 can also adopt an air-cooling or water-cooling structure;

[0021] The condensing cylinder 6 is also connected to a negative pressure device (not shown).

[0022] When the oil mist enters the condensation cylinder 6, the oil mist first contacts the first condensation fin 7. After the condensation fin 7 is powered on and subjected to a cooling treatment, the oil mist is rapidly liquefied into oil liquid and flows along the inclined surface of the condensation fin 7 to the oil return groove 8 below. When the oil mist that has not been completely treated passes through the remaining condensation fins 7, the oil mist is also rapidly liquefied into oil liquid and flows into the oil return groove 8 below, and is finally discharged through the oil drain port 9 at the bottom.

[0023] The upper and lower rows of condensing fins 7 of the utility model adopt a staggered overlapping structure, which reduces the flow rate of the oil mist channel and weakens the scouring force of the oil mist on the air film layer on the surface of the condensing fin 7. The oil mist in the channel is diverted more frequently, so that the air film layer on the surface of the condensing fin 7 is continuously destroyed, the formation of the air film layer is more strongly inhibited, the flow resistance is increased, and the oil mist can be quickly liquefied and collected.

[0024] A liquid crystal display screen 10 is provided on the outside of the condensing cylinder 6, and a power sensor (not shown) is connected to the condensing fin 7. The power sensor can monitor the ability of the condensing fin 7 to handle oil mist during live operation, and display the monitoring result on the liquid crystal display screen 10 to prompt the replacement of the battery 11.

[0025] The condensing fin 7 structure provided by the utility model has the characteristics of high heat transfer efficiency, small resistance, small size, light weight, compact structure, easy installation, easy cleaning or replacement and convenient maintenance. Through reasonable design and optimization, the function of processing oil mist is fully realized.

Claims

1. A multi-stage mechanical seal device, comprising a seal body arranged outside an oil groove, wherein the seal body forms at least one oil mist absorption chamber at a position surrounding the circumference of a rotating shaft, characterized in that: At least one of the oil mist absorption chambers is connected to a condensation cylinder through an oil mist absorption pipeline, and the condensation cylinder is also connected to a negative pressure device; The condenser cylinder is provided with a plurality of condenser fins inserted in an upward and downward relationship. The condenser fins are made of a material with good thermal conductivity, and gaps are left between adjacent condenser fins for oil mist to pass through. An oil return groove is provided at the bottom of the condenser cylinder, and the oil return groove is connected to the outside of the condenser cylinder through the oil discharge port.

2. The multi-stage mechanical sealing device according to claim 1, characterized in that: The sealing body forms two oil mist absorption chambers, an upper chamber and a lower chamber, and the oil mist absorption pipeline is connected to the lower chamber.

3. The multi-stage mechanical sealing device according to claim 1, characterized in that: The condensing fin is thicker on the outside and thinner in the middle.

4. The multi-stage mechanical sealing device according to claim 1, characterized in that: The condensing fins are heat-transfer connected to an electric refrigerator, and the electric refrigerator is connected to a battery.

5. The multi-stage mechanical sealing device according to claim 4, characterized in that: The electric refrigerator is arranged inside the condensing fin.

6. The multi-stage mechanical sealing device according to claim 4, characterized in that: A liquid crystal display screen is arranged outside the condensing cylinder, and a power sensor is connected to the condensing wing, and a signal of the power sensor is connected to the liquid crystal display screen.

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