JP7803510B2 - blower - Google Patents

Description

The present invention relates to a blower equipped with a sealing means.

As is well known, there are various demands and requirements for this type of blower.

For example, in the structure of a sealing plate (sealing device) that fits loosely onto the boss of the rotating shaft and is installed in the second casing unit, the purpose is to prevent dust, moisture, etc. that leaks through the gap with the boss from entering the motor bearing, thereby avoiding malfunctions, etc.

In some cases, combined sealing devices are used in sealing devices for this type of bearing.

The following related inventions are included in the prior art:
1) The device in Japanese Utility Model Application Laid-Open Publication No. 1-142598 is a structure that provides a pair of flingers on the bearing holder of the fan casing to prevent lubricant leakage and dust from getting in. However, this device is simply a pair of flingers and is not considered to function satisfactorily.
2) The invention in JP 8-168202 A is a bearing mechanism that consists of a collar fixed to the shaft, a housing, an inclined seal, a spiral seal, and an oil-resist plate, and the lubricating oil is pushed out from the bearing. The collar on the pushing side is designed to use centrifugal force to send the lubricating oil discharged from the bearing to the housing side and then discharge it from an outlet at the bottom of the bearing, and the structure is disclosed to prevent lubricant leakage and dust intrusion through the collar. However, it is not considered to function sufficiently as a seal.

Japanese Utility Model Application Laid-Open Publication No. 1-142598 Japanese Patent Application Publication No. 8-168202

In light of the above, the present invention aims to provide a blower equipped with a sealing means that can be suitably combined, consisting of a first sealing plate, a collar, and/or a V-ring attached to the collar, and a second sealing plate attached to the space between the step between the collar and the rotating shaft.

The present invention also provides a structure in which a collar is provided in a cutout (space) formed in the main body of a boss attached to the motor's rotating shaft, and a V-ring is placed in this collar, thereby enhancing the sealing effect while maintaining the same functionality and specifications as conventional bosses.

In order to achieve the above-mentioned aims of the present invention, claims 1-6 are provided.

Claim 1 is as follows:
a first casing unit;
a second casing unit provided in the first casing unit;
a rotating shaft inserted into a through hole formed in the second casing unit;
a boss fitted onto the tip of the rotating shaft;
a collar loosely fitted on the outer circumferential surface of the rotating shaft;
an impeller fixed to a rotary shaft via a boss and provided within a first casing unit,
The first seal plate has one end supported by the second casing unit, and the other end faces the boss or the collar.
A second seal plate is provided between the end face of the boss or collar and the step of the rotary shaft,
The first seal plate directly faces one end of the inner circumferential side of the impeller , and faces a portion of the boss that supports the impeller, with the impeller in between .
The blower is provided with a sealing means.

The invention of claim 1 therefore provides a blower equipped with a sealing means consisting of a combination of a first seal plate and/or a second seal plate, and also aims to prevent dust, moisture, etc. from entering the bearing interior and to prevent malfunctions, etc.

In claim 2,
a first casing unit;
a second casing unit provided in the first casing unit;
a rotating shaft inserted into a through hole formed in the second casing unit;
a boss fitted onto the tip of the rotating shaft;
a collar loosely fitted on the outer circumferential surface of the rotating shaft;
an impeller fixed to a rotary shaft via a boss and provided within a first casing unit,
The first seal plate has one end supported by the second casing unit, and the other end faces the boss or the collar.
A second seal plate is provided between the end face of the boss or collar and the step of the rotary shaft,
A V-ring is provided on the collar,
The first seal plate directly faces one end of the inner circumferential side of the impeller , and faces a portion of the boss that supports the impeller, with the impeller in between .
The blower is provided with a sealing means.

Therefore, the invention of claim 2 is an invention that is effective in achieving the purpose of claim 1. The same applies below, and further explanation is omitted.

In claim 3,
a first casing unit;
a second casing unit provided in the first casing unit;
a rotating shaft inserted into a through hole formed in the second casing unit;
a boss fitted onto the tip of the rotating shaft;
a collar loosely fitted on the outer circumferential surface of the rotating shaft;
an impeller fixed to a rotary shaft via a boss and provided within a first casing unit,
The first seal plate has one end supported by the second casing unit, and the other end faces the boss or the collar.
A second seal plate is provided between the end face of the boss or collar and the step of the rotary shaft,
a flexible seal material is provided on the first seal plate ;
The first seal plate directly faces one end of the inner circumferential side of the impeller , and faces a portion of the boss that supports the impeller, with the impeller in between .
The blower is provided with a sealing means.

In claim 4,
This blower is provided with a sealing means in which the first and second seal plates are made of a metal material.

In claim 5,
The other end of the first seal plate is a blower provided with a sealing means located closer to the rotary shaft than the outer peripheral end of the second seal plate that does not contact the collar or rotary shaft .

In claim 6,
The blower is provided with sealing means for forming a gap between the outer peripheral surface of the collar and the inner peripheral surface of the first seal plate.

Scaled side view of an example blower Front view of FIG. 1 is a partially cutaway cross-sectional view of a main part of a first embodiment; 1 is a partially cutaway cross-sectional view of a main part of a second embodiment; 10 is a partially cutaway cross-sectional view of the main part of the third embodiment. 4 is a partially cutaway cross-sectional view of a main part of the fourth embodiment. A cross-sectional view of a part of a conventional embodiment.

Each embodiment of the present invention will be described below. Each embodiment is a preferred example, and is not limited to the description and/or drawings of each embodiment. Therefore, structures that partially modify the configuration within the spirit of the invention, or structures that can achieve the same features and effects, are also within the scope of the present invention.

Figures 1 and 2 show the overall structure of blower A. The casing housing the impeller (fan) 11 is composed of a first casing unit 1 forming the outer casing and a pair of annular second casing units 2a and 2b that close the annular space inside the first casing unit 1. The second casing unit 2a is equipped with a motor 20 that drives the impeller 11 (described below). The rotating shaft 21 mounted on the motor 20 has its shaft tip 21a facing the central portion 101 of the second casing units 2a and 2b (casings). The impeller 11 is journaled in this central portion 101. The rotating shaft 21 is inserted into a through-hole 200 in the second casing unit 2a. Reference numeral 8 in the figure denotes a suction flange provided on the second casing unit 2b side.

In a blower A with this structure, for example, the impeller 11 rotates when the rotating shaft 21 is driven, and air, gas, and other vapors are drawn in through the casing's intake port (air inlet) and exhausted to the outside through the outlet (blowout port).

Figure 3 shows the first embodiment. A boss 22 is fitted onto the shaft tip 21a of the rotating shaft 21, and is fastened with a screw 24 to secure this fit. The boss 22 consists of a short main body 22a and a flange 22b attached to the main body 22a. When the boss 22 is fitted onto the shaft tip 21a of the rotating shaft 21, a space H1 is formed between the shaft body 21f of the rotating shaft 21 and the end face of the main body 22a (no reference number, the end face of the main body 22a on the motor side) into which a collar 4 can be inserted. The collar 4 is inserted into this space H1, and is loosely fitted onto the outer peripheral surface 21d of the rotating shaft 21.

However, the outer peripheral surface 40 of the collar 4 is lower than the outer peripheral surface 22a1 of the main body portion 22a, so that, for example, the thickness relationship is collar 4 < main body portion 22a.

In other words, the outer surface 40 of the collar 4 is positioned lower than the outer surface 22a1 of the main body 22a (lower relative to the axis 21e of the rotating shaft 21). This structure is effective in reducing costs, facilitating processing, and reducing weight.

The rotating shaft 21 is composed of, in order from the motor 20 side to the impeller 11 side, a thick-diameter shaft body 21f, a thin-diameter shaft base 21b, and a shaft tip 21a, with a step 21c between the shaft body 21f and the shaft base 21b. The collar 4 is provided in a space H1 formed between the base end side 22a1a of the body 22a of the boss 22 and the step 21c between the shaft body 21f and the shaft base 21b. This collar 4 is loosely fitted onto the outer peripheral surface 21d of the rotating shaft 21.

In this example, the collar 4 and main body 22a constitute the main body 022a of a conventional boss 022. In this structure, for example, a structure in which the thickness of the collar 4 is thin, as in this example, is effective in reducing costs, facilitating processing, and reducing weight.

As mentioned above, the first seal plate 5 is provided between the step 21c of the rotating shaft 21 and the end face of the main body 22a of the boss 22. A gap B is formed between the inner peripheral surface 50 of this first seal plate 5 and the outer peripheral surface 40 of the collar 4. The function of this gap B is to prevent the inner peripheral end 5c (other end 5b) of the first seal plate 5 from contacting the outer peripheral surface 40 of the collar 4. This serves, for example, to prevent wear and ensure durability of the first seal plate 5 and prevent abnormal noise. Furthermore, minimizing the gap B also serves to prevent air leakage and eliminate waste of the intake air (effective utilization and efficiency of the intake air, etc.; the same applies below). One end 5a of the first seal plate 5 is supported by the second casing unit 2a, and the other end 5b forms a gap B with the outer peripheral surface 40 of the collar 4 (the thin-walled outer peripheral surface of the main body 22a).

A disc-shaped second seal plate 6 is sandwiched (attached) between one end 4a of the base end 41 (motor 20 side) of the collar 4 and the step 21c of the rotating shaft 21. This means that assembly can be done with a single touch, ensuring reliable and easy installation. The role of this second seal plate 6 is to prevent, for example, the escape of dust and other particles from within the first casing unit 1 (casing).

In this first embodiment, the first sealing plate 5 and/or second sealing plate 6 function to prevent dust, moisture, etc. leaking through the gap with the boss from entering the motor bearing, thereby preventing malfunctions. Alternatively, it also prevents dust, etc. from entering the casing and/or, secondarily, the first casing unit 1 (casing, omitted below) and prevents intake air from leaking.

In the figure, reference numeral 7 denotes a key, which secures the rotating shaft 21 and boss 22. This key 7 is shorter than the conventional key 07.

Next, Figure 4 shows the second embodiment, whose basic structure is similar to that of the first embodiment. The structural features of this second embodiment are as follows: a flexible, disc-shaped V-ring 10 (sealing material, the same applies hereinafter) made of rubber or other material is fitted onto the outer surface 40 of the collar 4, with its main body 1000 positioned on the boss 22 side of the collar 4 and its lip 1001 positioned on the motor 20 side. Therefore, in the second embodiment, the first seal plate 5, a metal partition plate attached to the second casing unit 2a, the V-ring 10, and/or the second seal plate 6 function to prevent, for example, dust and other particles from entering the first casing unit 1 and to prevent intake air from leaking.

The collar 4 allows at least the V-ring 10 and/or the second seal plate 6 to be attached, and facilitates installation. In this second embodiment, the lip 1001 of the V-ring 10 does not contact one surface (the impeller 11 side) of the first seal plate 5. This non-contact structure is effective, for example, in reducing wear on the V-ring 10, ensuring durability, and preventing abnormal noise, but this is by way of example and is not limiting. The first seal plate 5 is made of a metal partition plate, but this is by way of example.

Figure 5 shows the third embodiment, whose basic structure is similar to that of the first and second embodiments. The structural features of this third embodiment are as follows: In this example, the relationship between the V-ring 10 and the first seal plate 5, a metal partition plate attached to the second casing unit 2a, is such that the lip 1001 of the V-ring 10 contacts one surface (the impeller 11 side) of the first seal plate 5. The effect and basic structure are similar to those of the first and second embodiments. Furthermore, in a structure in which the lip 1001 contacts one surface of the first seal plate 5, as in this third embodiment, the mounting structure of the V-ring 10 shown in the figure is optimal, and it also provides improved watertightness and, as mentioned above, prevents dust and other particles from entering the first casing unit 1, prevents intake air from leaking, and prevents abnormal noise. The first seal plate 5 is a metal partition plate, but this is by way of example and is not limiting.

Figure 6 shows the fourth embodiment, whose basic structure is similar to the first to third embodiments. The structural features of this fourth embodiment are as follows: a first seal plate 5, a metal partition plate, is attached to the second casing unit 2a, and a flexible seal 12 is attached to the end of the first seal plate 5. In this fourth embodiment, the free end 1200 of the flexible seal 12 attached to the end of the first seal plate 5 is bent and contacts the outer surface 40 of the collar 4. Therefore, in the fourth embodiment, the first seal plate 5, the flexible seal 12, and/or the second seal plate 6 (foreign matter scattering auxiliary plate) function to prevent, for example, the intrusion of dust and other particles into the first casing unit 1 and the leakage of intake air, as described above. The rest of the structure is similar to the first and second embodiments. Furthermore, in this fourth embodiment, as described above, the free end 1200 of the flexible sealing material 12 is bent and brought into contact with the outer peripheral surface 40 of the collar 4.

The flexible seal 12 is attached to the inner disk portion 5d of the disk-shaped first seal plate 5 (the inner disk portion 5d in this fourth embodiment is shorter than the portion corresponding to the inner disk portion 5d in the other embodiments), but this is just one example and is not limiting. The first seal plate 5 is a metal partition plate, but this is just one example. In this fourth embodiment, the flexible seal 12 is easy to replace. In this example, the first seal plate 5 and/or the flexible seal 12 are attached using fasteners 13 and 14, respectively.

The V-ring 10 mentioned above can be a commercially available V-ring, such as a V-30A or V-25A V-ring, but is not limited to these.

Note that Figure 7 is a partially cutaway cross-sectional view of the essential parts of one embodiment of a conventional blower, and although reference numerals are omitted, it shows the conventional key 07 and its longitudinal dimensions. The dimensional relationship of key 7 < conventional key 07. Furthermore, main body 22a < conventional main body 022a. Furthermore, a first seal plate 05, which functions in substantially the same way as the first seal plate 5, is provided in the conventional second casing unit 02a (casing). It also has a gap 0B.

The above-described embodiments are preferred examples. Structures that partially modify the configuration, or structures that achieve the same features and effects, within the spirit and scope of each embodiment, are also within the scope of the present invention.

A Blower B Gap 0B Gap H1 Space 1 First casing unit 101 Center portion 11 Impeller 2a, 2b Second casing unit 02a Conventional second casing unit 200 Through hole 20 Motor 21 Rotating shaft 21a Shaft tip portion 21b Shaft base portion 21c Step 21d Outer circumferential surface 21e Shaft center 21f Shaft body 22 Boss 022 Boss 22a Main body portion 022a Main body portion 22a1 Outer circumferential surface 22a1a Base end side 22b Flange piece 24 Screw 3 Stand 4 Collar 4a One end 40 Outer circumferential surface 41 Base end side 42 Tip side 5 First seal plate 05 First seal plate 5a One end 5b Other end 5c Inner peripheral end 5d: Inner disc portion 50: Inner peripheral surface 6: Second seal plate (foreign matter scattering auxiliary plate)
7 Key 07 Key 8 Suction flange 10 V-ring 1000 Main body 1001 Lip 12 Flexible sealing material 1200 Free end side 13 Stopper 14 Stopper

Claims (6)

a first casing unit;
a second casing unit provided in the first casing unit;
a rotating shaft inserted into a through hole formed in the second casing unit;
a boss fitted onto the tip of the rotary shaft;
a collar loosely fitted on the outer circumferential surface of the rotary shaft;
an impeller fixed to the rotary shaft via the boss and provided in the first casing unit,
a first seal plate having one end supported by the second casing unit and the other end directed toward the boss or the collar;
a second seal plate is provided between the end face of the boss or the collar and a step of the rotary shaft;
the first seal plate directly faces one end of the impeller on the inner circumferential side , and faces a portion of the boss that supports the impeller, with the impeller in between ;
A blower equipped with a sealing means. a first casing unit;
a second casing unit provided in the first casing unit;
a rotating shaft inserted into a through hole formed in the second casing unit;
a boss fitted onto the tip of the rotary shaft;
a collar loosely fitted on the outer circumferential surface of the rotary shaft;
an impeller fixed to the rotary shaft via the boss and provided in the first casing unit,
a first seal plate having one end supported by the second casing unit and the other end directed toward the boss or the collar;
a second seal plate is provided between the end face of the boss or the collar and a step of the rotary shaft;
A V-ring is provided on the collar,
the first seal plate directly faces one end of the impeller on the inner circumferential side , and faces a portion of the boss that supports the impeller, with the impeller in between ;
A blower equipped with a sealing means. a first casing unit;
a second casing unit provided in the first casing unit;
a rotating shaft inserted into a through hole formed in the second casing unit;
a boss fitted onto the tip of the rotary shaft;
a collar loosely fitted on the outer circumferential surface of the rotary shaft;
an impeller fixed to the rotary shaft via the boss and provided in the first casing unit,
a first seal plate having one end supported by the second casing unit and the other end directed toward the boss or the collar;
a second seal plate is provided between the end face of the boss or the collar and a step of the rotary shaft;
a flexible seal material is provided on the first seal plate ;
the first seal plate directly faces one end of the impeller on the inner circumferential side , and faces a portion of the boss that supports the impeller, with the impeller in between ;
A blower equipped with a sealing means. A blower equipped with the sealing means described in any one of claims 1 to 3, wherein the first and second seal plates are made of metal. 2. The blower equipped with a sealing means according to claim 1, wherein the other end of the first seal plate is positioned closer to the rotary shaft than the outer peripheral end of the second seal plate that does not contact the collar or the rotary shaft . A blower equipped with the sealing means described in any one of claims 1 to 5, configured to form a gap between the outer peripheral surface of the collar and the inner peripheral surface of the first seal plate.