CN219452493U - Piston ring type sealed centrifugal fan - Google Patents

Abstract

The utility model discloses a piston ring type sealed centrifugal fan, which comprises a frame, a motor, a transmission assembly, a bearing box, a main shaft, a fan shell, an impeller, a shaft cylinder sleeve, a clamping ring and an outer sealing assembly, wherein a shaft hole is formed in the joint of the main shaft of a rear side plate and a supporting plate of the fan shell, and the shaft cylinder sleeve is sleeved on the main shaft and is coaxially assembled in the shaft hole; the main shaft is provided with a ring groove at a shaft section overlapped with the shaft cylinder sleeve, the clamping ring is in the form of an open piston ring and is clamped in the ring groove, and the excircle is elastically pressed on the inner hole wall of the shaft cylinder sleeve; the outer sealing component is arranged on the outer end face of the shaft cylinder sleeve and can finish radial sealing of the main shaft. According to the piston ring type sealed centrifugal fan, the clamping ring in a piston ring mounting mode is used for blocking the gap of the shaft hole to realize closed pressure relief, so that the medium impact on an outside sealing assembly is reduced, the sealing effect is improved, and the service life of equipment is prolonged.

Description

Piston ring type sealed centrifugal fan

Technical Field

The utility model relates to the technical field of centrifugal fans, in particular to a piston ring type sealed centrifugal fan.

Background

The centrifugal fan is a machine for increasing the pressure of gas and discharging the gas by means of input mechanical energy. Centrifugal fans are widely used for ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induced draft of boilers and industrial kilns; cooling and ventilation in air-conditioning devices and household appliances; drying and selecting grains; inflation and propulsion of wind tunnel wind source and air cushion ship, etc.

Sealing of the shaft hole of the rear side plate of the volute and the main shaft of the centrifugal fan is always an important point in the industry. Under the general working condition, the gap is a negative pressure area, and serious leakage cannot exist. However, in special working situations, such as the transportation of hot gas media, toxic and harmful gas media or the transportation of gas media under pressure, the shaft hole must be sealed or leakage accidents occur. The existing shaft hole seal is often sealed by adopting a packing seal or a sealing ring, and when in the two sealing modes, the sealing part is in direct contact with a conveyed gas medium, cold and hot impact, air pressure change impact and particle impurity impact of wrapping, and the sealing material is invalid and leakage is generated under the long-time action.

Accordingly, there is a need to develop a piston ring sealed centrifugal fan that addresses the above-described problems.

Disclosure of Invention

The utility model aims to provide a piston ring type sealed centrifugal fan, which adopts a clamping ring in a piston ring mounting mode to block and seal a shaft hole gap for pressure relief, reduces medium impact on an outside sealing assembly, and improves sealing effect and equipment service life.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model relates to a piston ring type sealed centrifugal fan which comprises a frame, a motor, a transmission assembly, a bearing box, a main shaft, a fan shell, an impeller, a shaft cylinder sleeve, a clamping ring and an outer sealing assembly, wherein a shaft hole is formed in the joint of the main shaft between a rear side plate and a supporting plate of the fan shell, and the shaft cylinder sleeve is sleeved on the main shaft and is coaxially assembled in the shaft hole; the main shaft is provided with a ring groove at a shaft section overlapped with the shaft cylinder sleeve, the clamping ring is in the form of an open piston ring and is clamped in the ring groove, and the excircle is elastically pressed on the inner hole wall of the shaft cylinder sleeve; the outer sealing component is arranged on the outer end face of the shaft cylinder sleeve and can finish radial sealing of the main shaft.

Further, the two clamping rings are stacked together in pairs, the opening positions are staggered by 180 degrees, and the width of the annular groove is larger than the thickness of the two clamping rings.

Further, the number of the ring grooves is more than two, and two clamping rings are arranged.

Further, the device also comprises O-shaped rings, wherein the two O-shaped rings are arranged in the annular groove and are respectively positioned at two sides of the clamping ring to axially compress the two clamping rings.

Further, a rubber cushion is adhered to the end head of the opening of the clamping ring, and the section shape of the rubber cushion is consistent with that of the clamping ring.

Further, the outside seal assembly includes outer closing plate and sealing washer, the axle cylinder liner outer end is provided with the ring flange, outer closing plate passes through flange bolted connection the backup pad compresses tightly axle cylinder liner ring flange, the sealing washer sets up outer closing plate mesopore with between the main shaft.

Further, O-shaped rings for static seal are arranged on the mutual contact surfaces of the outer sealing plate, the shaft cylinder sleeve flange plate, the supporting plate and the rear side plate of the fan shell.

Compared with the prior art, the utility model has the beneficial technical effects that:

according to the piston ring type sealed centrifugal fan, the shaft sleeve and the clamping ring are arranged at the shaft hole, so that piston ring type sealing can be formed, when a gas medium at the inner side outwards moves through the gap of the shaft hole, the clamping ring is contacted at first, the metal clamping ring blocks and pressurizes air flow, particulate impurities are prevented from moving backwards in a stringing mode, and effective protection is formed on the sealing component at the outer side. According to the piston ring type sealed centrifugal fan, the clamping ring in a piston ring mounting mode is used for blocking the gap of the shaft hole to realize closed pressure relief, so that the medium impact on an outside sealing assembly is reduced, the sealing effect is improved, and the service life of equipment is prolonged.

In addition, the two clamping rings staggered in the opening positions are arranged in pairs, so that the flow of gas medium moving backwards at the opening can be reduced; by arranging two ring grooves, the gas impact force is further reduced. By installing an O-ring for static sealing between the plates installed in a stacked manner, it is possible to prevent the gaseous medium from overflowing outward from the plate slit gap. By arranging the O-shaped rings on the two sides of the clamping ring in an extrusion way, the two clamping rings can be tightly attached together, and the gap air leakage between the two clamping rings is reduced; meanwhile, the O-shaped ring can seal the ventilation gap between the clamping ring and the bottom surface of the ring groove, so that the sealing performance is improved. By bonding the rubber cushion at the opening end of the clamping ring, the rubber cushion can seal the opening of the piston ring and reduce radial ventilation when the clamping ring enters into the inner hole of the shaft cylinder sleeve to be tightly pressed.

Drawings

The utility model is further described with reference to the following description of the drawings.

FIG. 1 is a schematic diagram of a front view of a centrifugal fan with a piston ring seal according to the present utility model;

FIG. 2 is a schematic diagram of a left-hand structure of a main body part of the centrifugal fan of the utility model;

FIG. 3 is a schematic diagram of a cross-sectional left-hand view of a main body portion of a centrifugal fan according to the present utility model;

FIG. 4 is a schematic view of the part of the structure of the I part in FIG. 3;

FIG. 5 is a schematic view of a part of the structure of the portion I in FIG. 3 according to another embodiment of the present utility model;

fig. 6 is a schematic diagram of a snap ring structure according to the present utility model.

Reference numerals illustrate: 1. a frame; 101. a small support; 2. a motor; 3. a belt; 4. a bearing housing; 5. a main shaft; 501. a ring groove; 6. a blower housing; 601. a support plate; 7. a shaft cylinder sleeve; 8. an outer sealing plate; 9. a clasp; 10. a seal ring; 11. an O-ring; 12. an impeller.

Detailed Description

The core of the utility model is to provide a piston ring type sealed centrifugal fan, wherein a clamping ring in a piston ring mounting mode is used for blocking and sealing the gap of a shaft hole for pressure relief, so that the medium impact on an outside sealing assembly is reduced, the sealing effect is improved, and the service life of equipment is prolonged.

The following description of the embodiments of the present utility model will be made in detail with reference to the accompanying drawings, wherein it is apparent that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Referring to the drawings, FIG. 1 is a schematic diagram of a front view of a centrifugal fan with piston ring seal according to the present utility model; FIG. 2 is a schematic diagram of a left-hand structure of a main body part of the centrifugal fan of the utility model; FIG. 3 is a schematic diagram of a cross-sectional left-hand view of a main body portion of a centrifugal fan according to the present utility model; FIG. 4 is a schematic view of the part of the structure of the I part in FIG. 3; FIG. 5 is a schematic view of a part of the structure of the portion I in FIG. 3 according to another embodiment of the present utility model; fig. 6 is a schematic diagram of a snap ring structure according to the present utility model.

Example 1

As shown in fig. 1 to 4, a piston ring type sealed centrifugal fan comprises a frame 1, a motor 2, a transmission assembly, a bearing box 4, a main shaft 5, a fan shell 6 and an impeller 12, wherein the motor 2, the bearing box 4 and the fan shell 6 are all arranged on the frame 1, the bearing box 4 is arranged in an elevated manner through a small support 101 at the bottom, and the fan shell 6 is arranged on the frame 1 through support plates 601 connected with two side wall bolts. The transmission assembly specifically adopts a belt 3 and a belt pulley, the belt 3 transmits rotating speed and torque to a main shaft 5, the main shaft 5 is rotatably erected through a bearing box 4, and a cantilever end extends into a fan shell 6 and is connected with an impeller 12. The utility model differs from the centrifugal fan in the prior art mainly in that the utility model also comprises a shaft cylinder sleeve 7, a clamping ring 9 and an outer sealing component. The rear side plate of the fan housing 6 and the supporting plate 601 are provided with shaft holes at the penetrating joint of the main shaft 5, and the shaft cylinder sleeve 7 is sleeved on the main shaft 5 and is coaxially assembled in the shaft holes. The main shaft 5 is provided with the annular groove 501 at the shaft section overlapped with the shaft cylinder sleeve 7, the clamping ring 9 is in the form of an open piston ring and is arranged in the annular groove 501, and the outer circle is elastically pressed on the inner hole wall of the shaft cylinder sleeve 7, namely, the outer circle of the clamping ring 9 is fixedly pressed on the inner hole wall of the shaft cylinder sleeve 7, and the inner edge gap of the clamping ring 9 is embedded into the annular groove 501 and does not prevent the main shaft 5 from rotating. The outer sealing component is arranged on the outer end face of the shaft cylinder sleeve 7 and can complete radial sealing of the main shaft 5.

Through setting up axle cylinder liner 7 and snap ring 9 in shaft hole department, can form piston ring type seal, when inboard gaseous medium outwards drunkenness through the shaft hole clearance, at first contact snap ring 9, the metal snap ring blocks the pressurization to the air current, prevents that granule impurity from moving backward, right outside seal assembly forms effective protection. According to the piston ring type sealed centrifugal fan, the clamping ring in a piston ring mounting mode is used for blocking the gap of the shaft hole to realize closed pressure relief, so that the medium impact on an outside sealing assembly is reduced, the sealing effect is improved, and the service life of equipment is prolonged.

In a specific implementation of this embodiment, as shown in fig. 3 and 4, two snap rings 9 are stacked in pairs, and the opening positions are staggered by 180 degrees, and the width of the ring groove 501 is greater than the thickness of the two snap rings 9.

Specifically, the number of ring grooves 501 is two or more and two snap rings 9 are provided.

The two clamping rings 9 staggered with the opening positions are arranged in pairs, so that the flow of gas medium moving backwards at the opening position can be reduced; by providing two ring grooves 501, the gas impact force is further reduced.

In a specific implementation manner of this embodiment, as shown in fig. 2 to 4, the outer sealing assembly includes an outer sealing plate 8 and a sealing ring 10, a flange is disposed at the outer end of the shaft cylinder sleeve 7, the outer sealing plate 8 is connected with the supporting plate 601 through a flange bolt and compresses the flange of the shaft cylinder sleeve 7, and the sealing ring 10 is disposed between a hole in the outer sealing plate 8 and the main shaft 5. The seal ring 10 is specifically a lip seal ring or a Y-type fluororubber seal ring.

Obviously, the outer sealing assembly can also adopt a packing sealing mode or a mechanical sealing mode, and similar structural deformation modes fall into the protection scope of the utility model.

Specifically, the outer sealing plate 8, the flange of the shaft sleeve 7, the supporting plate 601 and the mutual contact surface of the rear side plate of the fan housing 6 are all provided with O-shaped rings for static sealing. Obviously, the similar sealing effect can be achieved by smearing sealant between the plates which are arranged in a superimposed manner, and similar deformation modes fall into the protection scope of the utility model.

By installing an O-ring for static sealing between the plates installed in a stacked manner, it is possible to prevent the gaseous medium from overflowing outward from the plate slit gap.

When the piston ring type sealed centrifugal fan of the embodiment works, in the running process, the motor 2 drives the belt pulley to rotate through the belt 3, the main shaft 5 transmits torque and rotating speed to the impeller 12, the impeller 12 centrifugally blows in the volute of the fan shell 6, and the gas medium in the pipeline is pumped continuously from the air inlet to the air outlet. When the gas medium is in outward movement along the gap between the inner hole of the shaft cylinder sleeve 7 and the outer wall of the main shaft 5 at the shaft hole of the rear side plate of the fan shell 6, the blocking pressure relief of the clamping ring 9 is met, and meanwhile, the wrapped particle impurities are blocked. A small portion of the gaseous medium is also reduced in pressure by bypassing the tortuous path between the inner edge of the snap ring 9 and the ring groove 501, thereby failing to provide pneumatic and temperature shock to the outer seal assembly.

Example 2

On the basis of the above-described embodiment 1, improvement of the sealing performance of the mounting position of the snap ring 9 forms this embodiment. As shown in fig. 5 and 6, the piston ring type sealed centrifugal fan of the present utility model further comprises O-rings 11, wherein the two O-rings 11 are disposed in the ring groove 501 and are respectively located at two sides of the snap ring 9 to axially compress the two snap rings 9.

Specifically, as shown in fig. 6, a rubber pad 901 is adhered to the open end of the snap ring 9, and the cross-sectional shape of the rubber pad 901 is identical to that of the snap ring 9.

By arranging the O-shaped rings 11 on the two sides of the clamping rings 9 in an extrusion way, the two clamping rings 9 can be tightly attached together, and the gap air leakage between the two clamping rings is reduced; meanwhile, the O-shaped ring 11 can seal the ventilation gap between the clamping ring 9 and the bottom surface of the ring groove 501, so that the sealing performance is improved. Through bonding cushion 901 at the open end of snap ring 9, under snap ring 9 enters into the compression state in the hole of axle cylinder liner 7, cushion 901 can seal the piston ring opening, reduces radial ventilation.

According to the centrifugal fan with the piston ring type seal, the shaft sleeve 7 and the clamping ring 9 are arranged at the shaft hole, so that the piston ring type seal can be formed, when a gas medium at the inner side outwards moves through the gap of the shaft hole, the gas medium firstly contacts with the clamping ring 9, the metal clamping ring blocks and pressurizes the gas flow, particulate impurities are prevented from moving backwards in a stringing mode, and effective protection is formed for the sealing component at the outer side. According to the piston ring type sealed centrifugal fan, the clamping ring in a piston ring mounting mode is used for blocking the gap of the shaft hole to realize closed pressure relief, so that the medium impact on an outside sealing assembly is reduced, the sealing effect is improved, and the service life of equipment is prolonged. In addition, the two clamping rings 9 staggered with the opening positions are arranged in pairs, so that the flow of gas medium moving backwards at the opening position can be reduced; by providing two ring grooves 501, the gas impact force is further reduced. By installing an O-ring for static sealing between the plates installed in a stacked manner, it is possible to prevent the gaseous medium from overflowing outward from the plate slit gap. By arranging the O-shaped rings 11 on the two sides of the clamping rings 9 in an extrusion way, the two clamping rings 9 can be tightly attached together, and the gap air leakage between the two clamping rings is reduced; meanwhile, the O-shaped ring 11 can seal the ventilation gap between the clamping ring 9 and the bottom surface of the ring groove 501, so that the sealing performance is improved. Through bonding cushion 901 at the open end of snap ring 9, under snap ring 9 enters into the compression state in the hole of axle cylinder liner 7, cushion 901 can seal the piston ring opening, reduces radial ventilation.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.

The above embodiments are only illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model should fall within the protection scope defined by the claims of the present utility model without departing from the design spirit of the present utility model.

Claims (7)

1. The centrifugal fan with the piston ring type seal comprises a frame (1), a motor (2), a transmission assembly, a bearing box (4), a main shaft (5), a fan shell (6) and an impeller (12), and is characterized by further comprising a shaft sleeve (7), a clamping ring (9) and an outer sealing assembly, wherein a shaft hole is formed in the position, where the main shaft (5) penetrates, of a rear side plate and a supporting plate (601) of the fan shell (6), and the shaft sleeve (7) is sleeved on the main shaft (5) and is coaxially assembled in the shaft hole; the main shaft (5) is provided with a ring groove (501) at a shaft section overlapped with the shaft cylinder sleeve (7), the clamping ring (9) is in the form of an open piston ring and is clamped in the ring groove (501), and the excircle is elastically pressed on the inner hole wall of the shaft cylinder sleeve (7); the outer sealing component is arranged on the outer end face of the shaft cylinder sleeve (7) and can finish radial sealing of the main shaft (5).

2. The piston ring sealed centrifugal fan of claim 1, wherein: the two clamping rings (9) are stacked in pairs, the opening positions are staggered by 180 degrees, and the width of the annular groove (501) is larger than the thickness of the two clamping rings (9).

3. The piston ring sealed centrifugal fan of claim 2, wherein: the number of the ring grooves (501) is more than two, and two clamping rings (9) are arranged.

4. A piston ring sealed centrifugal fan according to claim 2 or 3, wherein: the novel clamping ring further comprises O-shaped rings (11), wherein the two O-shaped rings (11) are arranged in the annular groove (501) and are respectively positioned at two sides of the clamping ring (9) to axially compress the two clamping rings (9).

5. The piston ring sealed centrifugal fan of claim 4, wherein: the opening end of the clamping ring (9) is adhered with a rubber pad (901), and the section shape of the rubber pad (901) is consistent with that of the clamping ring (9).

6. The piston ring sealed centrifugal fan of claim 1, wherein: the outside seal assembly comprises an outer seal plate (8) and a seal ring (10), a flange is arranged at the outer end of the shaft cylinder sleeve (7), the outer seal plate (8) is connected with the support plate (601) through a flange bolt and tightly presses the flange of the shaft cylinder sleeve (7), and the seal ring (10) is arranged between a middle hole of the outer seal plate (8) and the main shaft (5).

7. The piston ring sealed centrifugal fan of claim 6, wherein: the outer sealing plate (8), the flange plate of the shaft cylinder sleeve (7), the supporting plate (601) and the mutual contact surface of the rear side plate of the fan shell (6) are respectively provided with an O-shaped ring for static sealing.