CN213744120U - Shaft end sealing system of axial flow compressor - Google Patents

Abstract

The utility model belongs to the technical field of the axle head is sealed, a axial compressor axle head sealing system is disclosed. This axial compressor axle head sealing system includes: a plurality of annular grooves formed on the outer peripheral wall of the sealing section of the axial flow compressor rotor, wherein the annular grooves are arranged at intervals along the axial direction of the sealing section, and annular sealing tooth sheets with the outer diameter larger than the shaft diameter of the sealing section are respectively arranged in the annular grooves; the sealing body is fixed in a bearing box of the axial flow compressor and sleeved on each annular sealing tooth sheet, and the sealing body is positioned between a bearing and a hub section of the rotor; the outer diameters of the annular sealing tooth sheets are the same, the inner peripheral wall surface of the sealing body is a cylindrical surface matched with the annular sealing tooth sheets, an annular isolation cavity is formed in the middle area of the sealing body along the axial direction of the sealing section, and isolation gas with the pressure higher than the pressure of external gas is filled in the annular isolation cavity. The utility model discloses an axial compressor axle head sealing system has better sealing performance.

Description

Shaft end sealing system of axial flow compressor

Technical Field

The utility model belongs to the technical field of the axle head is sealed, concretely relates to axial compressor axle head sealing system.

Background

The axial compressor is a mechanical device for providing compressed gas, and is generally applied to air supply and gas compression in industries such as petroleum, chemical industry, metallurgy, environmental protection, pharmacy, ammonia production and the like. Axial flow compressors include a rotor containing a journal for mounting a bearing and a hub section for mounting rotor blades, one end of the rotor often being connected to a bearing housing within which the bearing is disposed, the journal penetrating into the bearing housing through an outlet of the bearing housing.

In the operation process of the device, a shaft end sealing device of the axial flow compressor is also arranged on a sealing section formed between a shaft neck and a hub section of a rotor of the axial flow compressor so as to prevent gas in a bearing box from leaking to the outside of the bearing box. Therefore, how to improve the sealing performance of the axial compressor shaft end sealing device is a very important problem in the design and production of the axial compressor.

The sealing mode of the shaft end of the existing axial flow compressor is usually set as follows: the periphery wall of the shaft end is provided with a plurality of annular grooves, sealing tooth sheets with different outer diameters are connected in the annular grooves, and sealing bodies are arranged outside the sealing tooth sheets to form a labyrinth type labyrinth sealing structure, and the sealing device has the following defects:

1) under the conditions of high temperature of the compressor, large thermal expansion amount of the shaft end and the like, the phenomenon of axial movement of the shaft end can occur, the sealing tooth sheet on the shaft end can interfere with the sealing body to scrape, and even the sealing body is damaged, so that poor sealing effect and gas leakage can be caused;

2) the shaft end sealing device is generally of an upper-lower-middle-division structure, and the problem of leakage possibly exists in a middle-division surface;

3) the labyrinth seal can not be completely sealed, and oil gas in the bearing box can leak into a medium flow passage of the axial flow compressor to cause medium pollution.

SUMMERY OF THE UTILITY MODEL

In order to improve the sealing performance of axial compressor axle head, the utility model provides an axial compressor axle head sealing system.

The utility model discloses an axial compressor shaft end sealing system uses on the seal section that forms between the axle journal of axial compressor rotor and the wheel hub section, according to the utility model discloses an axial compressor shaft end sealing system includes: a plurality of annular grooves formed on the outer peripheral wall of the sealing section of the rotor, wherein the annular grooves are arranged at intervals along the axial direction of the sealing section, and annular sealing tooth sheets with the outer diameter larger than the axial diameter of the sealing section are respectively arranged in the annular grooves; the sealing body is fixed in a bearing box of the axial flow compressor and sleeved on each annular sealing tooth sheet, and the sealing body is positioned between a bearing and a hub section of the rotor; the outer diameters of the annular sealing tooth sheets are the same, the inner peripheral wall surface of the sealing body is a cylindrical surface matched with the annular sealing tooth sheets, an annular isolation cavity is formed in the middle area of the sealing body along the axial direction of the sealing section, and isolation gas with the pressure higher than the pressure of external gas is filled in the annular isolation cavity.

Further, the seal includes along the axial of seal section in proper order and interval muffjoint first seal and the second seal on annular seal tooth piece, wherein, first seal and second seal structure as an organic whole, and the annular is kept apart the chamber and is formed between first seal and second seal, or first seal and second seal structure are two independent entity portion, and the annular is kept apart the chamber and is constituted by the internal face of first seal, second seal and bearing box jointly.

Further, the first sealing body and the second sealing body are constructed as a unitary ring-type structure.

Further, the first sealing body is located on one side close to a bearing of the rotor, the second sealing body is located on one side far away from the bearing of the rotor, and an oil hole penetrating through the first sealing body is formed in the outer peripheral wall of the first sealing body along the radial direction of the sealing section.

Further, axial compressor axle head sealing system still includes the sealing washer that sets up between seal and bearing box.

Further, axial compressor shaft end sealing system still includes: the isolation gas inlet channel is formed on the bearing box and communicated with the annular isolation cavity, and a pressure regulating valve is arranged on the isolation gas inlet channel; and the pressure regulating system is electrically connected with the pressure regulating valve, wherein the isolating gas inlet channel can be subjected to pressure regulation or on-off with an external gas source through the pressure regulating valve under the control of the pressure regulating system.

Furthermore, the axial flow compressor shaft end sealing system also comprises a pressure monitoring system, wherein the pressure monitoring system comprises a first monitoring end, a second monitoring end and an operation end, and the first monitoring end is positioned in the annular isolation cavity and used for detecting the pressure of the isolation gas; the second monitoring end is located outside the bearing box and used for monitoring the external gas pressure of the bearing box, and the operation end is electrically connected with the first monitoring end and the second monitoring end and used for monitoring the pressure of the isolation gas, the pressure of the external gas and the pressure difference between the isolation gas and the external gas.

Further, axial compressor axle head sealing system still includes the pressure taking mouth that forms on the bearing box and be linked together with annular isolation chamber, and first monitoring end sets up in pressure taking mouth.

Further, the pressure regulation system is electrically connected with a pressure monitoring system, the pressure monitoring system being configured to: when the pressure difference between the pressure of the isolation gas and the pressure of the external gas is monitored to be lower than a specified value, the pressure monitoring system can control the pressure regulating system to regulate the pressure regulating valve so as to regulate and increase the pressure of the isolation gas in the annular isolation cavity.

Further, axial compressor shaft end sealing system still includes the isolation gas outlet channel that forms on first sealing body and bearing box, and the isolation gas outlet channel is used for communicateing first sealing body and outside atmosphere.

Compared with the prior art, the utility model discloses an axial compressor axle head sealing system has the following advantage in several respects:

on one hand, an annular isolation cavity is formed in the sealing body, and isolation gas with pressure higher than that of external gas is filled in the annular isolation cavity, so that the introduced isolation gas flows to two sides, other media outside the bearing box are isolated from gas formed inside the bearing box, and a better sealing effect is achieved;

on the other hand, by setting the outer diameters of the annular sealing tooth sheets to be the same, the inner peripheral wall surface of the sealing body is configured to be a cylindrical surface matched with the annular sealing tooth sheets, so that the annular sealing tooth sheets on the sealing section cannot interfere with and scrape the sealing body even if the rotor axially moves; the seal is the whole ring structure, does not have the leakage problem of well minute face, has better sealed effect.

Drawings

Fig. 1 is a schematic cross-sectional structural view of an axial compressor shaft end sealing system according to an embodiment of the present invention;

fig. 2 is an enlarged view of the axial compressor shaft end sealing system of fig. 1 at C.

Detailed Description

For better understanding of the purpose, structure and function of the present invention, the shaft end sealing system of the axial flow compressor of the present invention will be described in further detail with reference to the accompanying drawings.

As in fig. 1 and fig. 2, the utility model discloses an axial compressor axle head sealing system 100 uses on the seal section 21 that forms between the axle journal of axial compressor rotor 2 and wheel hub section 24, according to the utility model discloses an axial compressor axle head sealing system 100's structure, include: a plurality of annular grooves 22 formed on the outer peripheral wall of a sealing section 21 of a rotor 2 of the axial flow compressor, wherein the annular grooves 22 are arranged at intervals along the axial direction of the sealing section 21, and annular sealing tooth sheets 23 with the outer diameter larger than the axial diameter of the sealing section 21 are respectively arranged in the annular grooves 22; and the seal body 1 fixed in bearing housing 3 of the axial compressor and sleeved on each annular seal tooth sheet 23, the seal body 1 is positioned between the bearing 33 of the rotor 2 and the hub section 24; the outer diameters of the annular sealing tooth sheets 23 are the same, the inner peripheral wall surface of the sealing body 1 is a cylindrical surface matched with the annular sealing tooth sheets 23, an annular isolation cavity 13 is formed in the middle area of the sealing body 1 along the axial direction of the sealing section 21, and the annular isolation cavity 13 is used for filling isolation gas A with pressure higher than that of external gas B.

When the axial flow compressor shaft end sealing system 100 of the embodiment is used, the inner wall of the sealing body 1 is matched with the annular sealing tooth blade 23 connected in the annular groove 22 on the sealing section 21 of the rotor 2 and fixed in the bearing box 3 of the axial flow compressor, when the rotor 2 rotates and the movable blade located in the middle position of the outer peripheral wall of the rotor 2 applies work to gas, the gas pressure outside the bearing box 3 is smaller than the gas pressure in the bearing box 3. Therefore, the gas in the bearing box 3 has a tendency to move towards the outside of the bearing box 3, and the gas in the bearing box 3 is isolated by the isolation gas a in the annular isolation cavity 13, so that the gas in the bearing box 3 cannot flow to the outside of the bearing box 3, and a sealing effect is realized.

The axial compressor shaft end sealing system 100 according to the present embodiment has the following advantages:

on one hand, an annular isolation cavity 13 is formed on the sealing body 1, and isolation gas A with pressure higher than that of external gas B is filled in the annular isolation cavity 13, so that the introduced isolation gas A flows to two sides, and gas media in the bearing box 3 cannot flow to the outside of the bearing box 3 to pollute subsequent working gas; the gas medium outside the bearing box 3 cannot flow into the bearing box 3 to pollute the lubricating oil, so that other gas outside the bearing box 3 and formed gas inside the bearing box 3 are isolated, and a better sealing effect is achieved;

on the other hand, by setting the outer diameter of each annular seal tooth piece 23 to be the same, the inner peripheral wall surface of the seal body 1 is configured as a cylindrical surface adapted to the annular seal tooth piece 23, so that even if the rotor 2 axially moves in the case where the temperature of the axial flow compressor is high, the thermal expansion amount of the rotor 2 is large, and the like, the annular seal tooth pieces 23 on the seal segment 21 do not interfere with and scrape the seal body 1, and a better sealing effect is obtained.

The term "match" used herein is understood to mean that the diameter of the inner peripheral wall surface of the seal body 1 is the same as the diameter of the cylindrical surface of the annular seal tooth piece 23. Or a small gap is formed between the diameter of the inner peripheral wall surface of the sealing body 1 and the cylindrical surface of the annular sealing tooth sheet 23, and the size of the gap can be preferably 0.1-1 mm.

Preferably, as shown in fig. 2, the sealing body 1 of the axial compressor shaft end sealing system 100 according to the present embodiment may include a first sealing body 11 and a second sealing body 12 sequentially and alternately sleeved on an annular sealing tooth piece 23 along the axial direction of the sealing section 21, wherein the first sealing body 11 and the second sealing body 12 may be configured as an integral structure, and an annular isolation cavity 13 is formed between the first sealing body 11 and the second sealing body 12, or the first sealing body 11 and the second sealing body 12 may be configured as two separate solid parts, and the annular isolation cavity 13 is jointly configured by the first sealing body 11, the second sealing body 12 and the inner wall surface of the bearing housing 3. When the first sealing body 11 and the second sealing body 12 are constructed as an integral structure, the assembly accuracy thereof is higher; when the first sealing body 11 and the second sealing body 12 are constructed into two relatively independent solid parts, the installation and the disassembly are more convenient, meanwhile, the first sealing body 11 and the second sealing body 12 are not influenced mutually when the sealing effect is realized, when one of the two sealing bodies goes wrong, only the sealing body which goes wrong needs to be replaced, and therefore the sealing structure is more economical.

In a preferred embodiment as shown in fig. 2, according to the axial compressor shaft end sealing system 100 of the present embodiment, both the first sealing body 11 and the second sealing body 12 may be constructed as an integral ring-type structure. By this arrangement, the structure of the first sealing body 11 and the second sealing body 12 is free from a cross section or a median plane. Therefore, the gas in the bearing box 3 cannot pass through the first sealing body 11 and the second sealing body 12 to leak, and the sealing effect is better; the problem of the seal body 1 having an uneven axial gap due to the deformation of the seal body 1 after precision machining caused by the division can also be prevented.

As shown in fig. 2, the first sealing body 11 may be located on a side close to the bearing 33 of the rotor 2, and the second sealing body 12 may be located on a side away from the bearing 33 of the rotor 2, wherein an oil hole 14 penetrating the first sealing body 11 may be formed in an outer circumferential wall of the first sealing body 11 in a radial direction of the seal segment 21. When the pressure of the gas outside the bearing housing 3 is relatively low compared to the pressure of the gas inside the bearing housing 3, the other relatively high-pressure gas such as the gas inside the bearing housing 3 moves toward the outside of the bearing housing 3, and the lubricating oil inside the bearing housing 3 moves toward the outside of the bearing housing 3 along the gap formed between the seal segment 21 and the inner wall of the seal body 1. Through the arrangement, lubricating oil in the bearing box 3 can flow back to the bearing box 3 through the lubricating hole 14, and subsequent acting gas is prevented from being polluted.

Preferably, as shown in fig. 2, the axial flow compressor shaft end sealing system 100 of the present embodiment may further include a sealing ring 5 disposed between the sealing body 1 and the bearing housing 3 to prevent gas inside the bearing housing 3 from leaking to the outside of the bearing housing 3 through a gap between the sealing body 1 and the bearing housing 3.

As shown in fig. 1 and fig. 2, the axial compressor shaft end sealing system 100 of the present embodiment may further include an isolating gas inlet channel 31 formed on the bearing housing 3 and communicated with the annular isolating cavity 13, the isolating gas inlet channel 31 being provided with a pressure regulating valve, and a pressure regulating system 16 electrically connected to the pressure regulating valve, wherein the isolating gas inlet channel 31 is capable of being pressure-regulated or switched on and off with an external gas source 161 through the pressure regulating valve under the control of the pressure regulating system 16. Through the setting, the pressure of the isolation gas A in the annular isolation cavity 13 can be adjusted, so that the pressure of the isolation gas A is higher than that of the external gas B, and the isolation gas A in the annular isolation cavity 13 is ensured to play a role in sealing and isolating.

Preferably, the pressure regulating system 16 can be configured to regulate the pressure of the isolation gas A in the annular isolation chamber 13, so that the pressure difference between the isolation gas A and the external gas B is maintained within a specified range that the pressure of the isolation gas A is 10-50 kPa higher than the pressure of the external gas B of the bearing box 3, thereby ensuring the stability of the sealing. Further preferably, the pressure regulating system 16 may be configured to dynamically adjust the pressure of the barrier gas a in the annular barrier chamber 13 in real time to reduce the consumption of the barrier gas a.

Preferably, as shown in fig. 1, the axial flow compressor shaft end sealing system 100 may further include a pressure monitoring system 15, and the pressure monitoring system 15 may include a first monitoring end 151, a second monitoring end 152 and a computing end (not shown in the figure), wherein the first monitoring end 151 is located in the annular isolation cavity 13 for detecting the pressure of the isolation gas a; the second monitoring terminal 152 is located outside the bearing housing 3 for monitoring the pressure of the gas B outside the bearing housing 3, and the operation terminal is electrically connected to the first monitoring terminal 151 and the second monitoring terminal 152 for monitoring the pressure of the isolation gas A, the pressure of the gas B and the pressure difference therebetween.

Through the setting, can make things convenient for operating personnel to monitor the pressure of isolation gas A in the annular isolation chamber 13 and the pressure of 3 outside gas B of bearing box, take measures such as supplementary isolation gas A in the annular isolation chamber 13 when the pressure of isolation gas A in the annular isolation chamber 13 will be less than the pressure of 3 outside gas B of bearing box, ensure that the pressure of isolation gas A in the annular isolation chamber 13 is higher than the pressure of outside gas B, avoid the isolation gas A in the annular isolation chamber 13 to lose the effect.

Preferably, the axial flow compressor shaft end sealing system 100 may further include a pressure taking port 153 formed on the bearing housing 3 and communicating with the annular isolation chamber 13, and the first monitoring end 151 may be disposed in the pressure taking port 153. Through this setting for keep apart the pressure of gas A in the chamber 13 can directly detect to first monitoring end 151, avoid appearing linking to each other with keeping apart gas inlet passage 31 when first monitoring end 151, keep apart gas inlet passage 31 when taking place to block up simultaneously, error pressure difference signal is monitored to first monitoring end 151, influences sealing function.

It should be noted that one or both of the pressure monitoring system 15 and the pressure adjusting system 16 may be provided, and when the pressure monitoring system 15 and the pressure adjusting system 16 are provided at the same time, the pressure adjusting system 16 may be electrically connected to the pressure monitoring system 15, and the pressure monitoring system 15 may be configured to: when it is monitored that the pressure difference between the pressure of the barrier gas a and the pressure of the outside gas B is below a specified value, the pressure monitoring system 15 can control the pressure regulating system 16 to regulate the pressure regulating valve to regulate and increase the pressure of the barrier gas a within the annular barrier chamber 13.

The "predetermined value" may be in the range of 10 to 50 kPa.

The pressure adjusting system 16 and the pressure monitoring system 15 can be linked through the arrangement, the process of monitoring and adjusting the pressure of the isolation gas A in the annular isolation cavity 13 is more intelligent, and the sealing stability of the axial flow compressor shaft end sealing system 100 is ensured.

Preferably, as shown in fig. 1 and 2, the axial compressor shaft end sealing system 100 may further include a shielding gas outlet passage 32 formed on the first sealing body 11 and the bearing housing 3, the shielding gas outlet passage 32 being operable to communicate the first sealing body 11 with the external atmosphere. Through setting up the export passageway 32 of keeping apart the gas of some malleation in can the bearing box 3 and leading to the export passageway 32 of keeping apart the gas, guarantee that the flow direction of keeping apart gas A in the first seal 11 points to the bearing end, guarantees to keep apart sealed effect. Meanwhile, the isolating gas A in the annular isolating cavity 13 can be timely diffused when needed, and the isolating gas A is prevented from entering the bearing box 3 to pollute lubricating oil.

In a preferred embodiment, the barrier gas outlet passage 32 is in open-close communication with the external atmosphere and also with the return tank.

The isolation gas A can be compressed nitrogen, compressed air or other pressurized gas meeting the sealing and isolating requirements; as described above, the bearing housing 3 can be used as a part of the axial compressor shaft end sealing system 100 of this embodiment, and the isolating gas inlet passage 31 and the isolating gas outlet passage 32 are provided on the bearing housing 3, the utility model discloses an axial compressor shaft end sealing system 100 can also not include the bearing housing 3, and the accessible is connected with the annular isolation cavity 13 if the pipeline of the isolating gas inlet passage 31 is connected with the annular isolation cavity 13, and the mode that the pipeline of the isolating gas outlet passage 32 is connected with the annular isolation cavity 13 is provided with the isolating gas inlet passage 31 and the isolating gas outlet passage 32.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present invention is not limited to the particular embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (10)

1. An axial flow compressor shaft end sealing system, comprising:

the axial flow compressor rotor comprises a sealing section, a plurality of annular grooves and a plurality of sealing tooth sheets, wherein the plurality of annular grooves are formed in the outer peripheral wall of the sealing section of the axial flow compressor rotor, the annular grooves are arranged at intervals along the axial direction of the sealing section, and the annular sealing tooth sheets with outer diameters larger than the axial diameter of the sealing section are respectively arranged in the annular grooves; and

the sealing body is fixed in a bearing box of the axial flow compressor and sleeved on each annular sealing tooth sheet, and the sealing body is positioned between a bearing and a hub section of the rotor;

the outer diameters of the annular sealing tooth sheets are the same, the inner peripheral wall surface of the sealing body is a cylindrical surface matched with the annular sealing tooth sheets, an annular isolation cavity is formed in the middle area of the sealing body along the axial direction of the sealing section, and isolation gas with pressure higher than the pressure of external gas is filled in the annular isolation cavity.

2. The axial compressor shaft end sealing system according to claim 1, wherein the sealing bodies include a first sealing body and a second sealing body which are sequentially sleeved on the annular sealing tooth piece along an axial direction of the sealing section at intervals, wherein the first sealing body and the second sealing body are constructed into an integral structure, the annular isolation cavity is formed between the first sealing body and the second sealing body, or the first sealing body and the second sealing body are constructed into two independent solid parts, and the annular isolation cavity is jointly formed by the first sealing body, the second sealing body and an inner wall surface of the bearing box.

3. The axial compressor shaft end seal system of claim 2, wherein the first sealing body and the second sealing body are configured as a unitary ring-type structure.

4. The axial compressor shaft end seal system according to claim 3, wherein the first seal body is located on a side close to a bearing of the rotor, and the second seal body is located on a side away from the bearing of the rotor, wherein an oil hole penetrating the first seal body is formed in an outer peripheral wall of the first seal body in a radial direction of the seal section.

5. The axial compressor shaft end seal system of claim 4, further comprising a seal ring disposed between the seal body and the bearing housing.

6. The axial compressor shaft end sealing system of any one of claims 2-5, further comprising: the isolation gas inlet channel is formed on the bearing box and communicated with the annular isolation cavity, and a pressure regulating valve is arranged on the isolation gas inlet channel; and the pressure regulating system is electrically connected with the pressure regulating valve, wherein the isolating gas inlet channel can be subjected to pressure regulation or on-off with an external gas source through the pressure regulating valve under the control of the pressure regulating system.

7. The axial flow compressor shaft end sealing system of claim 6, further comprising a pressure monitoring system, the pressure monitoring system comprising a first monitoring end, a second monitoring end and a computing end, wherein the first monitoring end is located in the annular isolation cavity for detecting an isolation gas pressure; the second monitoring end is located outside the bearing box and used for monitoring the external gas pressure of the bearing box, and the operation end is electrically connected with the first monitoring end and the second monitoring end and used for monitoring the pressure of the isolation gas, the pressure of the external gas and the pressure difference between the isolation gas and the external gas.

8. The axial compressor shaft end sealing system of claim 7, further comprising a pressure tap formed on the bearing housing and in communication with the annular isolation chamber, the first monitoring end being disposed within the pressure tap.

9. The axial compressor shaft end sealing system of claim 7, wherein the pressure regulation system is electrically connected with the pressure monitoring system, the pressure monitoring system configured to: when the pressure difference between the pressure of the isolation gas and the pressure of the external gas is monitored to be lower than a specified value, the pressure monitoring system can control the pressure regulating system to regulate the pressure regulating valve so as to regulate and increase the pressure of the isolation gas in the annular isolation cavity.

10. The axial compressor shaft end seal system of claim 6, further comprising a barrier gas outlet passage formed in the first sealing body and the bearing housing for communicating the first sealing body with an external atmosphere.

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