Shaft end sealing device of high-temperature and high-dust centrifugal fan

Abstract

A high-temperature and high-dust centrifugal fan shaft end sealing device comprises a centrifugal fan shell, a fan main shaft mounting hole is formed in the centrifugal fan shell in the left-right horizontal direction, a fan main shaft is inserted in the fan main shaft mounting hole, and a mechanical sealing device is arranged at the position, located on the centrifugal fan shell, of the fan main shaft. The mechanical sealing device comprises an isolation disc which is arranged on the fan main shaft in a sleeved mode in a clearance fit mode, the leftward end face of the isolation disc is attached to the centrifugal fan shell in a sealed mode, the isolation disc is fixedly connected with the centrifugal fan shell, the rightward end face of the isolation disc is attached to the leftward end face of a left sealing disc in a sealed mode, and the fan main shaft is sleeved with the left sealing disc in a clearance fit mode. And the left sealing disc is fixedly connected with the isolation disc. According to the shaft end sealing device of the high-temperature and high-dust centrifugal fan, air leakage at the dynamic and static combination position between a centrifugal fan shell of the centrifugal fan for a thermal power boiler and the shaft end of a main shaft of the fan can be reduced and eradicated, and dust is prevented from polluting the environment.

Description

Technical Field

[0001] The utility model relates to a shaft end sealing device for a high-temperature and high-dust centrifugal fan. Background Art

[0002] The operating conditions inside the centrifugal fan for thermal power boilers are high-temperature, high-dust, and high positive pressure operating conditions. As a result, during the operation of the fan, there is serious air leakage at the dynamic and static joint between the centrifugal fan housing and the shaft end of the fan main shaft. The leaked air will carry a large amount of dust, and the diffused dust will seriously pollute the on-site environment. Content of the Utility Model

[0003] The purpose of the utility model is to provide a shaft end sealing device for a high-temperature and high-dust centrifugal fan, which can reduce and eliminate air leakage at the dynamic and static joint between the centrifugal fan housing and the shaft end of the fan main shaft for thermal power boilers, and avoid dust from polluting the environment.

[0004] The shaft end sealing device for the high-temperature and high-dust centrifugal fan of the utility model includes a centrifugal fan housing. A fan main shaft installation hole is provided on the centrifugal fan housing along the left-right horizontal direction. A fan main shaft is inserted into the fan main shaft installation hole. A mechanical seal device is provided on the fan main shaft at the position of the centrifugal fan housing. The mechanical seal device includes an isolation disc sleeved on the fan main shaft with a clearance fit. The left-facing end surface of the isolation disc is hermetically attached to the centrifugal fan housing, and the isolation disc is fixedly connected to the centrifugal fan housing. The right-facing end surface of the isolation disc is hermetically attached to the left-facing end surface of the left sealing disc. The left sealing disc is sleeved on the fan main shaft with a clearance fit and is fixedly connected to the isolation disc.

[0005] On the right-facing end surface of the left sealing disc, an inner sealing groove and an outer sealing groove are sequentially arranged from the inside to the outside. An inner sealing ring is arranged in the inner sealing groove, and an outer sealing ring is arranged in the outer sealing groove. The right-facing sealing surfaces of the inner sealing ring and the outer sealing ring are respectively hermetically attached to the left-facing end surface of the shaft disc. The shaft disc is sleeved and fixed on the fan main shaft. The right-facing end surface of the shaft disc is hermetically attached to the left-facing end surface of the dynamic sealing ring. The dynamic sealing ring is arranged in a dynamic sealing ring groove. The dynamic sealing ring groove is arranged on the left-facing end surface of the right sealing disc. A plurality of pressure springs are arranged around in the dynamic sealing ring groove. The left-facing end surface of each pressure spring respectively abuts against the right-facing end surface of the dynamic sealing ring, and the right-facing end surface of each pressure spring respectively abuts against the bottom in the dynamic sealing ring groove.

[0006] An outer shaft sleeve is sleeved outside the shaft disc. The left end of the outer shaft sleeve abuts against the right-facing end surface of the left sealing disc, and the right end of the outer shaft sleeve abuts against the left-facing end surface of the right sealing disc. The outer shaft sleeve and the right sealing disc are fixedly connected to the left sealing disc. The outer shaft sleeve, the right sealing disc, and the left sealing disc enclose a dust-blocking cavity. The dust-blocking cavity is communicated with a pressure air source through an air pipe.

[0007] The shaft end sealing device of the high-temperature and high-dust centrifugal fan of the present utility model, wherein a dust suction hood is provided on the outer sides of the isolation disc, the left sealing disc, the outer shaft sleeve and the right sealing disc. The dust suction hood is fixedly connected to the centrifugal fan housing. A gas extraction port is provided on the dust suction hood. The gas extraction port on the dust suction hood communicates with the air inlet of the dust collector through an air extraction pipe in series with a fan.

[0008] The shaft end sealing device of the high-temperature and high-dust centrifugal fan of the present utility model, wherein the right sealing disc is fixedly connected to the left sealing disc through a plurality of bolts.

[0009] The shaft end sealing device of the high-temperature and high-dust centrifugal fan of the present utility model, wherein the inner sealing ring is fixed in the inner sealing groove by an inner positioning pin, and the outer sealing ring is fixed in the outer sealing groove by an outer positioning pin.

[0010] The shaft end sealing device of the high-temperature and high-dust centrifugal fan of the present utility model, wherein the left sealing disc is circular and made of steel.

[0011] The shaft end sealing device of the high-temperature and high-dust centrifugal fan of the present utility model, wherein the inner sealing groove and the outer sealing groove are coaxially arranged with the fan main shaft.

[0012] The shaft end sealing device of the high-temperature and high-dust centrifugal fan of the present utility model, wherein the right sealing disc is circular and made of steel.

[0013] The shaft end sealing device of the high-temperature and high-dust centrifugal fan of the present utility model, wherein the dynamic sealing ring groove is coaxially arranged with the fan main shaft.

[0014] The shaft end sealing device of the high-temperature and high-dust centrifugal fan of the present utility model, wherein the isolation disc and the centrifugal fan housing are made of steel, and the isolation disc is connected to the centrifugal fan housing by welding.

[0015] The shaft end sealing device of the high-temperature and high-dust centrifugal fan of the present utility model, wherein the right sealing disc is circular and made of steel.

[0016] The shaft end sealing device of the high-temperature and high-dust centrifugal fan of the present utility model, wherein the isolation disc is connected to the left sealing disc by welding.

[0017] The shaft end sealing device of the high-temperature and high-dust centrifugal fan of the present utility model, wherein the number of the pressure springs is 6 - 12.

[0018] When the shaft end sealing device of the high-temperature and high-dust centrifugal fan of the present utility model is in use, clean air from a pressure air source can be injected into the dust-blocking cavity through an air pipe. The pressure of the injected clean air should be greater than the air pressure inside the centrifugal fan. In this way, the injected clean air can reverse and push back the dusty gas that may leak out from the dynamic and static joint between the centrifugal fan housing and the shaft end of the fan spindle, so that no dusty gas can flow out from the dynamic and static joint between the centrifugal fan housing and the shaft end of the fan spindle. In addition, dust suction covers are provided on the outer sides of the isolation disc, the left sealing disc, the outer shaft sleeve and the right sealing disc of the present utility model. The dust suction covers are fixedly connected to the centrifugal fan housing. The dust suction covers are provided with air extraction ports. The air extraction ports on the dust suction covers are communicated with the air inlet of the dust collector through an air extraction pipe in series with a fan. When in use, the air in the dust suction covers can be extracted through the air extraction pipe to keep a negative pressure state in the dust suction covers, and it can also effectively prevent the leakage of the dusty gas from the dynamic and static joint between the centrifugal fan housing and the shaft end of the fan spindle. Therefore, the shaft end sealing device of the high-temperature and high-dust centrifugal fan of the present utility model can reduce and prevent the air volume leakage from the dynamic and static joint between the centrifugal fan housing and the shaft end of the centrifugal fan used in thermal power boilers, and avoid dust from polluting the environment.

[0019] The following further describes in detail a shaft end sealing device of a high-temperature and high-dust centrifugal fan of the present utility model with reference to the accompanying drawings. Description of the Drawings

[0020] Figure 1 It is a front sectional view of the structural schematic diagram of the shaft end sealing device of the high-temperature and high-dust centrifugal fan of the present utility model.

[0021] Figure 2 It is an enlarged front sectional view of the shaft disc part of the shaft end sealing device of the high-temperature and high-dust centrifugal fan of the present utility model. Detailed Embodiment

[0022] As Figure 1 and Figure 2 shown, the shaft end sealing device of the high-temperature and high-dust centrifugal fan of the present utility model includes a centrifugal fan housing 1. A fan spindle installation hole 2 is provided on the centrifugal fan housing 1 along the left-right horizontal direction. A fan spindle 3 is inserted into the fan spindle installation hole 2. A mechanical sealing device is provided on the fan spindle 3 at the position of the centrifugal fan housing 1. The mechanical sealing device includes an isolation disc 4 sleeved on the fan spindle 3 with an interference fit. The left end face of the isolation disc 4 is in sealed contact with the centrifugal fan housing 1, and the isolation disc 4 is fixedly connected to the centrifugal fan housing 1. The right end face of the isolation disc 4 is in sealed contact with the left end face of the left sealing disc 5. The left sealing disc 5 is sleeved on the fan spindle 3 with an interference fit, and the left sealing disc 5 is fixedly connected to the isolation disc 4;

[0023] On the right-facing end surface of the left sealing disc 5, an inner sealing groove 6 and an outer sealing groove 7 are successively provided from the inside out. An inner sealing ring 8 is provided in the inner sealing groove 6, and an outer sealing ring 9 is provided in the outer sealing groove 7. The right-facing sealing surfaces of the inner sealing ring 8 and the outer sealing ring 9 are respectively in sealing contact with the left-facing end surface of the shaft disc 10. The shaft disc 10 is sleeved and fixed on the main shaft 3 of the fan. The right-facing end surface of the shaft disc 10 is in sealing contact with the left-facing end surface of the dynamic sealing ring 11. The dynamic sealing ring 11 is arranged in the dynamic sealing ring groove 12. The dynamic sealing ring groove 12 is arranged on the left-facing end surface of the right sealing disc 13. A plurality of pressure springs 14 are arranged around in the dynamic sealing ring groove 12. The left-facing end surface of each pressure spring 14 respectively abuts against the right-facing end surface of the dynamic sealing ring 11, and the right-facing end surface of each pressure spring 14 respectively abuts against the bottom in the dynamic sealing ring groove 12;

[0024] An outer shaft sleeve 19 is sleeved outside the shaft disc 10. The left end of the outer shaft sleeve 19 abuts against the right-facing end surface of the left sealing disc 5, and the right end of the outer shaft sleeve 19 abuts against the left-facing end surface of the right sealing disc 13. The outer shaft sleeve 19, the right sealing disc 13 and the left sealing disc 5 are fixedly connected. The outer shaft sleeve 19, the right sealing disc 13 and the left sealing disc 5 enclose a dust-blocking cavity 15. The dust-blocking cavity 15 is communicated with a pressure gas source (not shown in the figure) through a gas pipe (not shown in the figure). The pressure gas source can be an air pump that can continuously supply high-pressure gas.

[0025] As a further improvement of the present invention, a dust suction hood 16 is provided outside the isolation disc 4, the left sealing disc 5, the outer shaft sleeve 19 and the right sealing disc 13. The dust suction hood 16 is fixedly connected to the centrifugal fan housing 1. An air extraction port 17 is provided on the dust suction hood 16. The air extraction port 17 on the dust suction hood 16 is communicated with the air inlet of a dust collector (not shown in the figure) through an air extraction pipe 18 in series with a fan (not shown in the figure).

[0026] As a further improvement of the present invention, the right sealing disc 13 is fixedly connected to the left sealing disc 5 through a plurality of bolts.

[0027] As a further improvement of the present invention, the inner sealing ring 8 is fixed in the inner sealing groove 6 by an inner positioning pin, and the outer sealing ring 9 is fixed in the outer sealing groove 7 by an outer positioning pin.

[0028] As a further improvement of the present invention, the left sealing disc 5 is circular and is made of steel.

[0029] As a further improvement of the present invention, the inner sealing groove 6 and the outer sealing groove 7 are coaxially arranged with the main shaft 3 of the fan.

[0030] As a further improvement of the present invention, the right sealing disc 13 is circular and is made of steel.

[0031] As a further improvement of the present utility model, the above-mentioned dynamic seal ring groove 12 is coaxially arranged with the blower main shaft 3.

[0032] As a further improvement of the present utility model, the above-mentioned isolation disc 4 and the centrifugal blower housing 1 are made of steel, and the isolation disc 4 is connected to the centrifugal blower housing 1 by welding.

[0033] As a further improvement of the present utility model, the above-mentioned right seal disc 13 is circular and made of steel.

[0034] As a further improvement of the present utility model, the above-mentioned isolation disc 4 is connected to the left seal disc 5 by welding.

[0035] As a further improvement of the present utility model, the number of the above-mentioned pressure springs 14 is 6 - 12.

[0036] When the shaft end seal device of the high-temperature and high-dust centrifugal blower of the present utility model is in use, clean air from a pressure air source can be injected into the dust-blocking cavity 15 through an air pipe. The pressure of the injected clean air should be greater than the air pressure inside the centrifugal blower, so that the injected clean air can reverse-push the dust-containing gas that may leak out from the dynamic and static joint between the centrifugal blower housing and the shaft end of the blower main shaft, preventing the dust-containing gas from flowing out from the dynamic and static joint between the centrifugal blower housing and the shaft end of the blower main shaft. In addition, on the outer sides of the isolation disc 4, the left seal disc 5, the outer shaft sleeve 19 and the right seal disc 13 of the present utility model, there is a dust suction hood 16. The dust suction hood 16 is fixedly connected to the centrifugal blower housing 1. The dust suction hood 16 is provided with an air extraction port 17. The air extraction port 17 on the dust suction hood 16 is communicated with the air inlet of a dust collector through an air extraction pipe 18 in series with a blower. When in use, the air in the dust suction hood 16 can be extracted through the air extraction pipe 18 to keep a negative pressure state in the dust suction hood 16, effectively preventing the leakage of the dust-containing gas from the dynamic and static joint between the centrifugal blower housing and the shaft end of the blower main shaft. Therefore, the shaft end seal device of the high-temperature and high-dust centrifugal blower of the present utility model can reduce and prevent the air volume leakage at the dynamic and static joint between the centrifugal blower housing and the shaft end of the centrifugal blower for thermal power boilers, avoiding dust pollution to the environment.

Claims

1. A high-temperature and high-dust centrifugal fan shaft end sealing device, comprising a centrifugal fan housing (1), the centrifugal fan housing (1) being provided with a fan main shaft mounting hole (2) along the left and right horizontal directions, a fan main shaft (3) being inserted into the fan main shaft mounting hole (2), and a mechanical sealing device being provided on the fan main shaft (3) at the centrifugal fan housing (1), characterized in that: The mechanical sealing device comprises an isolating disc (4) mounted on the fan main shaft (3) with a clearance fit, the left end surface of the isolating disc (4) being in sealing contact with the centrifugal fan housing (1), the isolating disc (4) being fixedly connected to the centrifugal fan housing (1), the right end surface of the isolating disc (4) being in sealing contact with the left end surface of the left sealing disc (5), the left sealing disc (5) being mounted on the fan main shaft (3) with a clearance fit, and the left sealing disc (5) being fixedly connected to the isolating disc (4); The left sealing disc (5) has an inner sealing groove (6) and an outer sealing groove (7) on its right-facing end face from inside to outside, an inner sealing ring (8) is provided in the inner sealing groove (6), and an outer sealing ring (9) is provided in the outer sealing groove (7). The right-facing sealing surfaces of the inner sealing ring (8) and the right-facing sealing surfaces of the outer sealing ring (9) are respectively sealed against the left-facing end face of the shaft disc (10). The shaft disc (10) is fixedly mounted on the fan main shaft (3). The right-facing end face of the shaft disc (10) is in contact with the moving shaft. The left end faces of the sealing ring (11) are sealed against each other, the dynamic sealing ring (11) is arranged in the dynamic sealing ring groove (12), the dynamic sealing ring groove (12) is arranged on the left end face of the right sealing disk (13), a plurality of pressure springs (14) are arranged around the dynamic sealing ring groove (12), the left end face of each pressure spring (14) is respectively pressed against the right end face of the dynamic sealing ring (11), and the right end face of each pressure spring (14) is respectively pressed against the bottom of the dynamic sealing ring groove (12); An outer sleeve (19) is sleeved on the outer side of the shaft disc (10); the left end of the outer sleeve (19) is pressed against the right end surface of the left sealing disc (5); the right end of the outer sleeve (19) is pressed against the left end surface of the right sealing disc (13); the outer sleeve (19) and the right sealing disc (13) are fixedly connected with the left sealing disc (5); the outer sleeve (19), the right sealing disc (13) and the left sealing disc (5) form a dust-blocking cavity (15); and the dust-blocking cavity (15) is communicated with a pressure gas source through an air pipe.

2. The shaft end sealing device of a high temperature and high dust centrifugal fan according to claim 1 is characterized in that: An ash suction hood (16) is provided on the outer sides of the isolation disk (4), the left sealing disk (5), the outer shaft sleeve (19) and the right sealing disk (13); the ash suction hood (16) is fixedly connected to the centrifugal fan housing (1); an air suction port (17) is provided on the ash suction hood (16); the air suction port (17) on the ash suction hood (16) is communicated with the air inlet of the dust collector through an air suction pipe (18) connected in series with the fan.

3. The shaft end sealing device of a high temperature and high dust centrifugal fan according to claim 2 is characterized in that: The right sealing disk (13) is fixedly connected to the left sealing disk (5) via a plurality of bolts.

4. The shaft end sealing device of a high temperature and high dust centrifugal fan according to claim 3 is characterized in that: The inner sealing ring (8) is fixed in the inner sealing groove (6) by means of an inner positioning pin, and the outer sealing ring (9) is fixed in the outer sealing groove (7) by means of an outer positioning pin.

5. The shaft end sealing device of a high temperature and high dust centrifugal fan according to claim 4 is characterized in that: The left sealing disk (5) is circular and is made of steel.

6. The shaft end sealing device of a high temperature and high dust centrifugal fan according to claim 5, characterized in that: The inner sealing groove (6) and the outer sealing groove (7) are coaxially arranged with the fan main shaft (3).

7. The shaft end sealing device of a high temperature and high dust centrifugal fan according to claim 6, characterized in that: The right sealing disk (13) is circular and is made of steel.

8. The shaft end sealing device of a high temperature and high dust centrifugal fan according to claim 7, characterized in that: The dynamic sealing ring groove (12) is coaxially arranged with the fan main shaft (3).

9. The shaft end sealing device of a high temperature and high dust centrifugal fan according to claim 8, characterized in that: The isolation disk (4) and the centrifugal fan housing (1) are made of steel, and the isolation disk (4) and the centrifugal fan housing (1) are connected by welding.

10. The shaft end sealing device of a high temperature and high dust centrifugal fan according to claim 9, characterized in that: The isolation disk (4) is connected to the left sealing disk (5) by welding.

11. The shaft end sealing device of a high temperature and high dust centrifugal fan according to claim 10, characterized in that: The number of the pressure springs (14) is 6-12.

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