Oil seepage prevention sealing assembly for steam turbine body bearing bush temperature measuring point leading-out wire

Abstract

The utility model discloses a steam turbine body bearing bush temperature measuring point leading-out wire anti-oil-seepage sealing assembly, which belongs to the technical field of thermal power plant steam turbine body in-cylinder bearing bush measuring point leading-out wire anti-oil-seepage sealing, and comprises a connecting piece with an annular structure, one side wall of the connecting piece is provided with an internal thread ring, and the other side wall of the connecting piece is provided with an external thread ring. A sealing assembly is arranged on one side of the outer threaded ring. According to the utility model, the temperature lead in the cylinder is subjected to thermal shrinkage treatment, the temperature lead of the sealing component is armored (prevented from being damaged by stress) and is independently sealed, and meanwhile, the nylon sealing ring (with grease) and the stainless steel circular pressing gasket are matched, so that the sealing performance is further ensured, the problem of oil leakage can be thoroughly solved, the reliability is strong, maintenance is avoided, and the service life is long. Meanwhile, the inside and the outside of the cylinder and leads are integrated, installation is convenient, sealing is reliable, high-temperature resistance and oil seepage prevention are achieved, and measuring point sudden change protection misoperation caused by temperature measuring point oil seepage is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-seepage oil sealing for measuring point leads of shaft bearings in the cylinder body of a steam turbine in a thermal power plant, and particularly relates to an anti-seepage oil sealing assembly for the measuring point leads of the shaft bearing temperature in the cylinder body of a steam turbine. Background Technique

[0002] A steam turbine is one of the three major main engines in the thermal power plant system. A steam turbine is a rotary prime mover that uses steam to do work. The process of converting the thermal energy of steam into the mechanical energy of the rotation of the turbine rotor requires two energy conversions. That is, when steam passes through the turbine nozzle (static blade), the thermal energy of the steam is converted into the kinetic energy of the high-speed flow of steam. Then, when the high-speed air flow passes through the working blade, the kinetic energy of the steam is converted into the mechanical energy of the rotation of the turbine rotor.

[0003] During the operation of a steam turbine, friction between bearings is a common phenomenon. However, this kind of friction often brings phenomena such as bearing heating, wear, and running jams. Therefore, the role of lubricating oil is crucial. Lubricating oil can establish an oil film between bearings to reduce the collision and friction between bearings; lubricating oil also has a certain vibration absorption effect and heat absorption and cooling effects. The use of lubricating oil greatly reduces the loss of parts and improves the operation efficiency.

[0004] The measuring points of the bearing bush temperature, thrust bearing bush temperature, TSI speed, displacement, etc. are important parameters for monitoring and protecting the safe operation of the steam turbine. During the operation of the steam turbine, the oil system in the cylinder flushes the bearing bush and the lead wires of the thermal control measuring points in the cylinder. There is a risk that the lubricating oil leaks along the measuring point leads of the bearing bush temperature, etc. to the cable trough box, junction box, and terminal outside the cylinder, causing the temperature measuring point to jump and the steam turbine to trip falsely. In addition, there is accumulated oil in the cable trough box where the measuring point lead is located, and the ambient temperature around the cylinder body of the steam turbine is relatively high, which also poses a great fire safety hazard. Therefore, there is an urgent need for an anti-seepage oil sealing assembly for the measuring point leads of the bearing bush temperature in the cylinder body of the steam turbine to solve the above problems. Content of the Utility Model

[0005] The main purpose of the utility model is to provide an anti-seepage oil sealing assembly for the measuring point leads of the bearing bush temperature in the cylinder body of a steam turbine.

[0006] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0007] An anti-oil leakage sealing assembly for the temperature measuring point lead-out wire of the bearing bush of a steam turbine body, comprising a connecting piece with an annular structure. An internal thread ring is arranged on one side wall of the connecting piece, and an external thread ring is installed on the other side wall of the connecting piece. A sealing assembly is arranged on one side of the external thread ring. The sealing assembly consists of a nylon sealing ring, symmetrically arranged circular gaskets, a through cavity and through holes. Two groups of temperature leads are sleeved inside the connecting piece. A protective sleeve is arranged on the outer side of the part of the temperature lead located in the cylinder, and an armored layer is arranged on the outer side of the part of the temperature lead located at the sealing assembly.

[0008] Preferably, both the internal thread ring and the external thread ring are welded to the connecting piece.

[0009] Preferably, the through cavity is formed on the nylon sealing ring, the through holes are formed on the circular gaskets. The material of the circular gaskets is stainless steel. The nylon sealing ring is greased. The number of the through holes and the through cavity is not unique, and can be two groups or four groups.

[0010] Preferably, the protective sleeve is bonded to the surface of the temperature lead by means of heat concentration technology.

[0011] Preferably, the armored layer is laminated on the surface of the temperature lead.

[0012] Preferably, a connecting screw sleeve is arranged on one side of the sealing assembly, and the connecting screw sleeve matches the specifications of the external thread ring.

[0013] Preferably, a protective sleeve is arranged on the part of the temperature lead located outside the cylinder, and the lead penetrates through the connecting piece, the circular gaskets, the nylon sealing ring and the connecting screw sleeve.

[0014] The beneficial technical effects of the present utility model:

[0015] By heat shrinking the temperature leads in the cylinder part, using armored (to avoid damage due to force) and separately sealing the temperature leads in the sealing component part of the present utility model, and cooperating with a nylon sealing ring (greased) and a stainless steel circular pressing gasket, the sealing performance is further ensured, the oil leakage problem can be completely solved, with strong reliability and maintenance-free. At the same time, the integration of inside and outside the cylinder and the leads is realized, which is convenient for installation, has reliable sealing, is resistant to high temperature and anti-oil leakage, and avoids the misoperation of the protection caused by the sudden change of the measuring point due to oil leakage at the temperature measuring point. Description of the drawings

[0016] Figure 1 It is a schematic structural diagram of a preferred embodiment of an anti-oil leakage sealing assembly for the temperature measuring point lead-out wire of the bearing bush of a steam turbine body according to the present utility model;

[0017] Figure 2The figure is a schematic structural view of a sealing component in a preferred embodiment of an anti-oil-leakage sealing assembly for a temperature measuring point lead-out wire of a steam turbine body bearing shell according to the present utility model.

[0018] The reference numerals are explained as follows:

[0019] 1. Connector; 2. Internal thread ring; 3. External thread ring; 4. Sealing component; 401. Nylon sealing ring; 402. Circular gasket; 403. Through cavity; 404. Through hole; 5. Connecting sleeve; 6. Temperature lead; 7. Armor layer; 8. Protective sleeve; 9. Protection sleeve. Specific embodiments

[0020] To make the technical solutions of the present utility model clearer and more definite for those skilled in the art, the present utility model will be further described in detail below in conjunction with embodiments and drawings, but the implementation manners of the present utility model are not limited thereto.

[0021] As Figure 1 - Figure 2 shown, an anti-oil-leakage sealing assembly for a temperature measuring point lead-out wire of a steam turbine body bearing shell provided in this embodiment includes a connector 1 with an annular structure. An internal thread ring 2 is provided on one side wall of the connector 1, and an external thread ring 3 is installed on the other side wall of the connector 1. A sealing component 4 is provided on one side of the external thread ring 3. The sealing component 4 is composed of a nylon sealing ring 401, symmetrically arranged circular gaskets 402, a through cavity 403, and through holes 404. Two groups of temperature leads 6 are sleeved inside the connector 1. A protection sleeve 9 is provided on the outer side of the part of the temperature lead 6 located inside the cylinder, and an armor layer 7 is provided on the outer side of the part of the temperature lead 6 located at the sealing component 4.

[0022] Both the internal thread ring 2 and the external thread ring 3 are welded to the connector 1. The internal thread ring 2 can be connected to the connection port reserved on the cylinder block, and then the device is installed on the cylinder block.

[0023] The through cavity 403 is formed on the nylon sealing ring 401, and the through holes 404 are formed on the circular gaskets 402. The material of the circular gaskets 402 is stainless steel. The nylon sealing ring 401 is greased. The number of the through holes 404 and the through cavity 403 is not unique, and can be two groups or four groups. The nylon sealing ring 401 and the circular gaskets 402 can further seal the connection part between the temperature lead 6 and the connector 1.

[0024] The protection sleeve 9 is bonded to the surface of the temperature lead 6 by means of heat concentration technology. The protection sleeve 9 can protect the part of the temperature lead 6 located inside the cylinder.

[0025] The armor layer 7 is pressed on the surface of the temperature lead 6. The armor layer 7 can prevent the temperature lead 6 from being damaged at the sealing component 4 and improve its strength.

[0026] On one side of the sealing component 4, there is a connecting sleeve 5, which is matched with the specifications of the external thread ring 3. The connecting sleeve 5 can be connected to the external thread ring 3, thereby hiding the nylon sealing ring 401 and the circular gasket 402 to achieve the overall installation of the device.

[0027] The part of the temperature lead 6 outside the cylinder is provided with a protective sleeve 8. The lead passes through the connecting piece 1, the circular gasket 402, the nylon sealing ring 401 and the connecting sleeve 5. The protective sleeve 8 can protect the part of the temperature lead 6 outside the cylinder.

[0028] The working principle of this device: First, connect the internal thread ring 2 to the reserved connection port of the cylinder block, and then connect the connecting sleeve 5 to the external thread ring 3, thereby hiding the nylon sealing ring 401 and the circular gasket 402 to achieve the overall installation of the device. Then, the temperature lead 6 transfers the temperature inside the cylinder to the external detection instrument. During the detection process, since the temperature lead 6 inside the cylinder is heat-shrunk, the temperature lead 6 of the sealing component part is armored to avoid damage due to stress and is separately sealed. At the same time, in cooperation with the nylon sealing ring 401 with grease and the stainless steel circular pressing gasket, the sealing performance is further guaranteed, the oil leakage problem can be completely solved, the reliability is strong, maintenance-free, and the integration of the inside and outside of the cylinder and the lead is realized, which is convenient for installation, has reliable sealing, high temperature resistance, and anti-oil leakage, and avoids misoperation of the protection due to sudden change of the measuring point caused by oil leakage at the temperature measuring point.

[0029] The above is only a further embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the scope disclosed by the present invention, according to the technical solution and its concept of the present invention, makes equivalent substitutions or changes, all belong to the protection scope of the present invention.

Claims

1. An anti-leakage oil seal assembly for a temperature measuring point lead-out line of a steam turbine body bearing, characterized in that: The invention comprises a connecting piece (1) of an annular structure, wherein an internal thread ring (2) is arranged on one side wall of the connecting piece (1), an external thread ring (3) is installed on the other side wall of the connecting piece (1), a sealing assembly (4) is arranged on one side of the external thread ring (3), and the sealing assembly (4) is composed of a nylon sealing ring (401), a symmetrically arranged circular gasket (402), a through cavity (403) and a through hole (404), and two groups of temperature leads (6) are arranged inside the connecting piece (1), a protective sleeve (9) is arranged outside the part of the temperature lead (6) located in the cylinder, and an armor layer (7) is arranged outside the part of the temperature lead (6) located in the sealing assembly (4).

2. The anti-oil leakage seal assembly for the lead-out line of the temperature measuring point of the steam turbine body bearing according to claim 1 is characterized in that: The internal thread ring (2) and the external thread ring (3) are both welded to the connecting piece (1).

3. The anti-oil leakage seal assembly for the lead-out line of the temperature measuring point of the steam turbine body bearing according to claim 2, characterized in that: The through cavity (403) is formed on the nylon sealing ring (401), and the through hole (404) is formed on the circular gasket (402). The circular gasket (402) is made of stainless steel, and the nylon sealing ring (401) is greased. The number of the through holes (404) and the through cavity (403) is not unique, and can be two groups or four groups.

4. The anti-oil leakage seal assembly for the lead-out line of the temperature measuring point of the steam turbine body bearing according to claim 3 is characterized in that: The protective sleeve (9) is bonded to the surface of the temperature lead (6) by using a thermal concentration technique.

5. The anti-oil leakage seal assembly for the lead-out line of the temperature measuring point of the steam turbine body bearing according to claim 4, characterized in that: The armor layer (7) is pressed onto the surface of the temperature lead (6).

6. The anti-oil leakage seal assembly for the lead-out line of the temperature measuring point of the steam turbine body bearing according to claim 5, characterized in that: A connecting screw sleeve (5) is provided on one side of the sealing component (4), and the specifications of the connecting screw sleeve (5) match those of the external thread ring (3).

7. The anti-oil leakage seal assembly for the lead-out line of the temperature measuring point of the steam turbine body bearing according to claim 6, characterized in that: The portion of the temperature lead (6) located outside the cylinder is provided with a protective sleeve (8), and the lead passes through the connecting piece (1), the circular gasket (402), the nylon sealing ring (401) and the connecting screw sleeve (5).

Images