TW201538856A - Shaft seal structure of blower - Google Patents

Abstract

A shaft seal structure of a blower is provided for being mounted to a blower. The shaft seal structure has a shaft seal chamber that is connected to at least a first tube and a second tube. The first tube is connected to the shaft seal chamber of the shaft seal structure and an inlet opening of the blower. The second tube conveys predetermined blocking gas to the shaft seal chamber of the shaft seal structure. As a result, the gas in the interior of the shaft seal chamber can flow into the inlet opening through the first tube, so as to make the interior of the shaft seal chamber in a negative pressure condition thereby preventing isolation gas from leakage through the shaft seal portion of the blower. Then, the second tube delivers the blocking gas to the shaft seal chamber to further prevent the isolation gas from leakage through the shaft seal of the blower so as to achieve an effect of doubled sealing. Further, the blocking gas may flow into the inlet opening of the blower through the first tube, and then flow into the shaft seal chamber again to establish a circulation, thereby effectively reducing the consumption of the blocking gas.

Description

Fan shaft seal structure

The invention relates to a shaft seal structure of a wind turbine, in particular to a shaft seal structure which has the double sealing benefit and can effectively reduce the gas consumption of a resisting.

In order to prevent the gas in the process environment from leaking to the atmosphere side through the gap between the drive shaft of the equipment or the fan, a set of fan shaft seal devices are generally installed at the end of the fan, and the drive shaft is rotatably pivoted therein. The purpose of preventing gas leakage in the process environment is achieved by the fan shaft sealing device.

The conventional fan shaft sealing device, as shown in FIG. 1A, is a conventional mechanical fan shaft seal A, and as shown in FIG. 2A, a conventional non-mechanical fan shaft seal B, whichever is The fan shaft sealing device is connected to the fan shaft seals A and B with a pipe body A1 and B1. A high-pressure gas is blocked from the pipe bodies A1 and B1 to the inside of the fan shaft seals A and B, so that the gas in a process environment It is impossible to leak from the gap between the fan shaft seals A and B to the atmosphere side. However, in the conventional manner, the gas is a high-pressure gas, so that the resisting gas used is more likely to leak from the gap between the fan shaft seals A and B, resulting in the consumption of the resisting gas used (ie, the amount of leakage). Large, resulting in high costs.

Another conventional fan shaft sealing device, as shown in FIG. 1B, is a conventional mechanical fan shaft seal C, and as shown in FIG. 2B, a conventional non-mechanical fan shaft seal D, wherein no matter which The fan shaft sealing device is connected to the fan shaft seal C and D with a pipe body C1 and D1, and the pipe body is connected. One end of C1 and D1 is connected to the fan shaft seals C and D and the other end is connected to the fan air inlet E. When using a fan, the gas leaking from the gaps of the fan shaft seals C and D can be sucked back to the fan suction. The air outlet E makes it impossible for the gas in a process environment to leak to the atmosphere side. However, in the conventional manner, when the fan is stopped, the gas in a process environment leaks from the gaps of the fan shaft seals C and D to the atmosphere side; in addition, when the fan is running, the fan shaft seals C and D The inside is in a negative pressure state, so the external atmosphere flows from the fan shaft seals C and D, and then flows into the fan system through the tubes C1 and D1, so that the conventional fan system is only suitable for application to allow external gas to flow in. Equipment or environment.

In order to solve the problems and the defects of the above-mentioned prior art, the present invention discloses a shaft seal structure of a fan for coupling to a fan; wherein the shaft seal chamber of the shaft seal structure is respectively connected with at least one first tube body and at least one The second pipe body is connected by the first pipe body to the shaft sealing chamber of the shaft sealing structure and the air inlet of the fan, and the second pipe body transmits a predetermined blocking gas to the shaft sealing chamber of the shaft sealing structure. Thereby, the gas inside the shaft sealing chamber can flow into the air inlet of the fan through the first pipe body, so that the inside of the shaft sealing chamber has a negative pressure state, so as to prevent an insulating gas from being leaked from the shaft seal of the fan, and then transmitted by the second pipe body. Blocking the gas into the shaft sealing chamber, further avoiding the leakage of an insulating gas from the shaft seal of the fan to achieve the double sealing benefit; in addition, the blocking gas can flow from the first pipe body into the air inlet of the fan, and then into the shaft sealing chamber to form a Cycling, which can effectively reduce the consumption of gas.

100‧‧‧ fan

1‧‧‧Shell

11‧‧‧ bottom

12‧‧‧ openings

13‧‧‧ air chamber

14‧‧‧Inlet hood

15‧‧‧Air inlet

2‧‧‧ Impeller

21‧‧‧ shaft

3‧‧‧ bearing structure

4‧‧‧ shaft seal

41‧‧‧ shaft seal room

42‧‧‧First tube

421‧‧‧ first entrance

422‧‧‧first exit end

423‧‧‧First valve

43‧‧‧Second body

431‧‧‧Second entrance

432‧‧‧second exit

433‧‧‧Second valve

200‧‧‧ scheduled work space

300‧‧‧External atmospheric space

A, B, C, D‧‧‧ fan shaft seal

A1, B1, C1, D1‧‧‧ pipe body

E‧‧‧fan air intake

Fig. 1A is a schematic view showing a first embodiment of a conventional mechanical fan shaft seal structure.

Fig. 1B is a schematic view showing a second embodiment of a conventional mechanical fan shaft seal structure.

2A is a schematic view showing a first embodiment of a conventional non-mechanical fan shaft seal structure.

2B is a schematic view showing a second embodiment of a conventional non-mechanical fan shaft seal structure.

Fig. 3 is a schematic view showing the shaft seal structure of the fan of the present invention.

Figure 4 is a partially enlarged schematic view showing a first application embodiment of the shaft seal structure of the fan of the present invention.

Figure 5 is a partially enlarged schematic view showing a second application embodiment of the shaft seal structure of the fan of the present invention.

The features and advantages of the present invention will be described in detail in conjunction with the accompanying drawings. The present invention is further described in detail, but does not limit the scope of the invention in any way.

The invention discloses a shaft seal structure of a fan. Please refer to the figures 3 and 4 for coupling to a fan 100 so that one side of the fan 100 is a predetermined working space 200 and the other side thereof is an external part. The atmosphere 300 has an insulating gas in the predetermined working space 200. The fan 100 includes a casing 1, an impeller 2, a bearing structure 3 and a shaft sealing structure 4.

The outer casing 1 is provided with a bottom portion 11 on one side and an opening portion 12 on the other side thereof, and an air chamber 13 is disposed inside the outer casing 1. The outer casing 1 is provided with an air inlet cover 14 at the opening portion 12, and the air inlet cover 14 faces the outer casing. 1 The outer opening is formed with an air inlet 15. The air inlet 15 is located in the predetermined working space 200.

The impeller 2 is disposed in the air chamber 13 of the outer casing 1. The impeller 2 has one end corresponding to the opening of the air inlet cover 14 toward the inside of the outer casing 1 and the other end thereof is provided with a shaft 21 extending out of the outer casing 1.

The bearing structure 3 is coupled to the shaft 21 of the impeller 2 for supporting the rotation of the impeller 2.

The shaft seal structure 4 is disposed outside the bottom portion 11 of the outer casing 1 and sleeves the shaft 21 of the impeller 2. The shaft seal structure 4 is provided with a shaft seal chamber 41, and the shaft seal chamber 41 is respectively connected with at least one first tube body 42 and The first tube body 42 has a first inlet end 421 at one end and a first outlet end 422 at the other end, and is disposed between the first inlet end 421 and the first outlet end 422. There is a first valve 423. The second tube body 43 has a second inlet end 431 at one end and a second outlet end 432 at the other end, and a second between the second inlet end 431 and the second outlet end 432. The first inlet end 421 of the first tube body 42 is in communication with the shaft sealing chamber 41. The first outlet end 422 of the first tube body 42 is located at the air inlet 15 of the fan 100, and the first outlet end 422 The second inlet end 431 of the second tube body 43 is configured to transmit a predetermined blocking gas (eg, N 2 gas), and the second outlet end 432 of the second tube body 43 is coupled to the inlet hood 14 . The shaft sealing chambers 41 are connected in communication such that the blocking gas can flow into the shaft sealing chamber 41 of the shaft sealing structure 4 via the second tube body 43.

When the fan 100 is started, the insulating gas in the predetermined working space 200 can enter the preset fan system from the air inlet 15; at this time, the gas inside the shaft sealing chamber 41 of the shaft sealing structure 4 can be sequentially passed through the first pipe body 42. The first inlet end 421 and the first outlet end 422 flow into the air inlet 15 of the fan 100, so that the inside of the shaft sealing chamber 41 has a negative pressure state, so that some of the insulating gas flowing into the shaft sealing chamber 41 can flow in from the first tube 42. The air inlet 15 prevents an insulating gas from being leaked from the shaft sealing structure 4 of the fan 100; at the same time, the second tube body 43 can discharge the blocking gas (for example, N2 gas) into the shaft sealing chamber 41, and the blocking gas is located at the shaft. The sealing chamber 41 not only prevents the insulating gas from being leaked from the shaft sealing structure 4 of the fan 100, but also prevents the gas in the external atmospheric space 300 from flowing from the shaft sealing structure 4, thereby achieving the double sealing benefit.

Furthermore, the blocking gas discharged into the shaft sealing chamber 41 can be sequentially passed through the first tube body. The first inlet end 421 and the first outlet end 422 of the 42 flow into the air inlet 15 and flow into the shaft sealing chamber 41 to form a cycle, which can effectively reduce the consumption of the blocking gas (ie, the amount of leakage).

The first valve 423 provided by the first pipe body 42 and the second valve 433 provided by the second pipe body 43 are provided to adjust the ambient air pressure required by the user according to the ambient air pressure of the predetermined working space 200.

Please refer to FIG. 5 at the same time, wherein the shaft seal structure 4 may be a non-mechanical shaft seal structure (as shown in FIGS. 3 and 4), or the shaft seal structure 4 may be Mechanical shaft seal structure (as shown in Figure 5).

The detailed description above is a detailed description of a possible embodiment of the present invention, and the embodiment is not intended to limit the invention, and equivalent implementations or modifications that are not departing from the spirit of the invention should be included in the present invention. In the scope of patents.

100‧‧‧ fan

1‧‧‧Shell

11‧‧‧ bottom

12‧‧‧ openings

13‧‧‧ air chamber

14‧‧‧Inlet hood

15‧‧‧Air inlet

2‧‧‧ Impeller

21‧‧‧ shaft

3‧‧‧ bearing structure

4‧‧‧ shaft seal structure

41‧‧‧ shaft seal room

42‧‧‧First tube

421‧‧‧ first entrance

422‧‧‧first exit end

423‧‧‧First valve

43‧‧‧Second body

431‧‧‧Second entrance

432‧‧‧second exit

433‧‧‧Second valve

200‧‧‧ scheduled work space

300‧‧‧External atmospheric space

Claims (5)

A shaft seal structure of a fan, the shaft seal is coupled to a fan, the fan is provided with an air inlet, and the fan has a predetermined working space on one side and an external atmosphere on the other side, the air inlet is located at The predetermined working space; the shaft sealing structure is provided with a shaft sealing chamber, wherein the shaft sealing chamber is respectively connected with at least one first tube body and at least one second tube body, wherein the first tube body is provided with a first end An inlet end and a other end thereof are provided with a first outlet end, the first inlet end is in communication with the shaft sealing chamber, the first outlet end is located at the air inlet of the fan, and the second tube body is provided with a first end The second inlet end and the other end thereof are provided with a second outlet end for transmitting a predetermined blocking gas, and the second outlet end is in communication with the shaft sealing chamber, and the blocking gas is passed through the second The tube body flows into the shaft sealing chamber; when the fan rotates, the gas inside the shaft sealing chamber can sequentially flow into the air inlet through the first inlet end and the first outlet end of the first tube body, so that the shaft seals the chamber The part has a negative pressure state. The shaft seal structure of the fan of claim 1, wherein the first pipe body is provided with a first valve between the first inlet end and the first outlet end. The shaft seal structure of the fan of claim 1, wherein the second tube body is provided with a second valve between the second inlet end and the second outlet end. The shaft seal structure of the fan of claim 1, wherein the shaft seal structure is a non-mechanical shaft seal structure. The shaft seal structure of the fan of claim 1, wherein the shaft seal structure is a mechanical shaft seal structure.