TWI671482B - Industrial seals and seals - Google Patents

Abstract

The present invention provides an industrial seal having an excellent trapping function for trapping magnetic foreign matter, and a sealing device including the industrial seal. The industrial seal (1) includes: a plate-shaped lip (2), one end (2a) of which is in contact with a shaft (101) as a sealed portion; a magnet (3); One end (4a) is located on the lip (2) in a state where one end (2a) is located at a distance D1 from the lip (2) and the other end (4b) is in contact with one of the two magnetic poles of the magnet (3). One side (21); and a plate-shaped inner yoke (5) at one end (5a) at a distance from the end (2a) of the lip (2) at a distance of D2 and the other end (5b) and two of the magnet 3 The other side of the magnetic pole is laminated on the other side (22) of the lip (2); the distance D1 and the distance D2 have a relationship of D1> D2, and the sealing device (10) is provided with the industrial seal (1) .

Description

Industrial seals and seals

The present invention relates to an industrial seal and a sealing device including the same.

When machining a magnetic body such as iron with a lathe, a grinder, or the like, the machining surface is often supplied with cutting oil or water, and the machining surface is cooled and cleaned. Therefore, in order to suppress the entry of foreign matter such as grinding powder or chips, a seal is attached to a rotating part or a linear guide part of the device. As such a seal, there is known a seal having a plurality of lip portions that are in contact with a sealed portion such as a rotating portion.

However, since the lip portion of a general seal is made of rubber, etc., when sharp-shaped grinding powder, etc., is mixed with cutting oil, etc., and enters between the lip portion and the sealed portion, the lip portion may be damaged prematurely. problem.

In order to solve the above-mentioned problems, a seal is known that uses magnetic force to trap magnetic foreign matter such as cutting powder (for example, refer to Patent Documents 1 and 2).

However, the conventional seals described in Patent Documents 1 and 2 have insufficient functions for trapping foreign matters.

[Prior technical literature] [Patent Literature]

Patent Document 1: Japanese Patent Application Laid-Open No. 9-210212

Patent Document 2: Japanese Patent Application Laid-Open No. 2005-214220

An object of the present invention is to provide an industrial seal having an excellent trapping function for trapping magnetic foreign matter, and a sealing device including the industrial seal.

The industrial seal of the present invention includes: a plate-shaped lip portion, one end of which is in contact with the portion to be sealed; a magnet; and a plate-shaped outer yoke, which is located at a distance of D1 from one end of the lip portion at the one end and And one of the two magnetic poles of the magnet is laminated on one side of the lip; and a plate-shaped inner yoke is located at one end at a distance D2 from one end of the lip and the other end is in contact with two of the magnet. A state in which the other of the magnetic poles is in contact is laminated on the other surface of the lip; the distance D1 and the distance D2 have a relationship of D1> D2.

A sealing device according to the present invention includes: the industrial seal of the present invention described above; and a main seal, which is located further downstream than the industrial seal described above with respect to the foreign matter entry direction.

According to the present invention, there is an effect that an excellent trapping function is provided for trapping magnetic foreign matter such as cutting powder.

1‧‧‧Industrial Seals

2‧‧‧ lips

2a, 4a, 5a

2b, 4b, 5b ‧‧‧ the other end

3‧‧‧ Magnet

3a, 3b ‧‧‧ magnetic pole

4‧‧‧ outside yoke

5‧‧‧ inner yoke

6‧‧‧ steps

10‧‧‧sealing device

11‧‧‧main seal

12‧‧‧ first lip

13‧‧‧Second lip

14‧‧‧ Reinforcement

21‧‧‧ side

22‧‧‧ the other side

100‧‧‧ Equipment

101‧‧‧axis

102‧‧‧ Bolt

211‧‧‧parts

A‧‧‧ Foreigner entering direction

D1, D2‧‧‧ distance

S‧‧‧rotation shaft

FIG. 1 is a cross-sectional view showing an industrial seal and a sealing device according to an embodiment of the present invention.

Hereinafter, an industrial seal (hereinafter, sometimes referred to as a “seal”) and a sealing device according to an embodiment of the present invention will be described in detail with reference to FIG. 1.

<Industrial Seals>

As shown in FIG. 1, the seal 1 of this embodiment is mounted on the device 100. The device 100 supplies cutting oil or water to the working surface, and processes magnetic bodies such as iron while cooling and cleaning the working surface. Examples of such equipment 100 include, but are not limited to, lathes and grinders.

The device 100 of the present embodiment includes a cylindrical shaft 101 that rotates in a predetermined direction with the rotation axis S as a reference. The seal 1 of this embodiment suppresses the entry of magnetic foreign matter such as grinding powder or cutting powder into the shaft 101, and is therefore mounted on the device 100 via the bolt 102. The overall shape of the seal 1 according to this embodiment is configured in a ring shape surrounding the shaft 101.

The seal 1 according to the present embodiment includes a lip portion 2, a magnet 3, an outer yoke 4, and an inner yoke 5 as its constituent members. Hereinafter, each constituent member of the seal 1 according to this embodiment will be described in order.

(Lip)

The lip portion 2 of the present embodiment is a plate-shaped member in which one end 2 a is in contact with the shaft 101 as a sealed portion (sliding portion) and seals the shaft 101. The lip 2 functions as a part that blocks cutting oil or the like in which magnetic foreign matter such as abrasive powder is mixed. In addition, as mentioned above, since the seal 1 of this embodiment is ring-shaped, the lip 2 is also ring-shaped. Therefore, in this embodiment, one end 2a of the lip 2 is an inner peripheral surface, and the other end 2b of the lip 2 is an outer peripheral surface. The same applies to the outer yoke 4 and the inner yoke 5 to be described later.

The lip 2 of this embodiment is composed of fibers impregnated (impregnated) with an elastic material. According to this structure, the lip portion is flexible, and the lip portion 2 is not easily damaged even if it comes into contact with foreign matter such as cutting powder, and therefore, it can exhibit excellent durability. In addition, since the friction coefficient with respect to the shaft 101 is reduced, the abrasion resistance is also improved, so that excellent abrasion resistance, low heat generation, and low sliding resistance can be achieved. In addition, instead of impregnation, the elastic material may be applied, and an elastic material may be contained in the spaces between the fibers. When the elastic material is impregnated or applied, in order to perform these processes smoothly, the elastic material is preferably dissolved in a solvent or the like to form a liquid state. It is also possible to impregnate or apply a liquid resin adhesive.

Examples of the elastic material include rubber and elastomer. Examples of the rubber include natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, ethylene-propylene rubber, butyl rubber, chloroprene rubber, nitrile rubber, and acrylic acid. Rubber, epichlorohydrin rubber Rubber, chlorinated polyethylene rubber, silicone rubber, polyurethane rubber, fluorine rubber, nitrile butadiene rubber (NBR), hydrogenated nitrile butadiene rubber (H-NBR), etc. Examples of the elastomer include thermoplastic elastomers such as polyester-based elastomers, polyamide-based elastomers, and polyolefin-based elastomers. The above-mentioned exemplified elastic material can be used by mixing one kind or two or more kinds.

Examples of the fiber include synthetic fibers such as aliphatic polyamide fibers, aromatic polyamide fibers, aromatic polyamide fibers, polyester fibers, polyurethane fibers, acetate fibers, and fluoro fibers, cotton, silk, and hemp. Such as natural fibers, rayon, glass fibers, metal fibers with low hardness, etc. The above-mentioned fiber systems exemplified can be used by mixing one kind or two or more kinds. Examples of the form of the fibers include woven fabrics, non-woven fabrics, and knitted fabrics. Textile cloth includes canvas.

The thickness of the lip portion 2 is preferably 0.4 to 3.0 mm, but is not limited thereto.

(magnet)

The magnet 3 of this embodiment has a magnetic pole 3a and a magnetic pole 3b in this order from the upstream side with respect to the foreign matter entering direction A. The magnetic poles 3a, 3b have opposite polarities. That is, when the magnetic pole 3a is an S pole, the magnetic pole 3b is an N pole. When the magnetic pole 3a is an N pole, the magnetic pole 3b is an S pole.

The magnet 3 of this embodiment is located at the other end 2 b of the lip 2. In addition, as long as the magnet 3 can form a magnetic loop by being in contact with the outer yoke 4 and the inner yoke 5 described later, the magnet 3 is not limited to the structure located at the other end 2b of the lip 2 and can be disposed in the magnetic loop The desired bit Home.

(Outer yoke and inner yoke)

Both the outer yoke 4 and the inner yoke 5 of this embodiment are made of a magnetic material. Examples of the magnetic material include, but are not limited to, iron and steel.

Both the outer yoke 4 and the inner yoke 5 are plate-shaped members. The thickness of each of the outer yoke 4 and the inner yoke 5 is preferably 0.8 to 3.6 mm, but is not limited thereto. The thicknesses of the outer yoke 4 and the inner yoke 5 may be the same or different from each other.

Both the outer yoke 4 and the inner yoke 5 are laminated on the lip 2. Specifically, the above-mentioned lip 2 has one surface 21 and the other surface 22 in order from the upstream side with respect to the foreign object entry direction A. The outer yoke 4 is laminated on one surface 21 of the lip 2, and the inner yoke 5 is laminated on the other surface 22 of the lip 2.

Here, in this embodiment, the outer yoke 4 and the inner yoke 5 are laminated on the lip 2 in a specific state. Specifically, the outer yoke 4 is located at a distance D1 from one end 2a of the lip 2 at one end 4a and the other end 4b is in contact with one of the two magnetic poles of the magnet 3, that is, the magnetic pole 3a of the magnetic poles 3a, 3b. Is laminated on one surface 21 of the lip 2 in a state of. In addition, the inner yoke 5 is located at a distance D2 from one end 2a of the lip 2 at one end 5a and the other end 5b is in contact with the other of the two magnetic poles of the magnet 3, that is, the magnetic pole 3b of the magnetic poles 3a, 3b. It is laminated | stacked on the other surface 22 of the lip part 2 in a state. According to the above configuration, when the magnetic pole 3a is an S pole, the magnetic When the pole 3b is an N pole, the outer yoke 4 becomes an S pole, and the inner yoke 5 becomes an N pole. When the magnetic pole 3a is an N pole and the magnetic pole 3b is an S pole, the outer yoke 4 becomes an N pole and the inner yoke 5 becomes an S pole. In either case, the outer yoke 4 and the inner yoke 5 function as a yoke that guides a magnetic force, and as a result, the seal 1 has a magnetic body collecting function. Accordingly, the magnetic force generated between the one end 4 a of the outer yoke 4 and the one end 5 a of the inner yoke 5 can capture magnetic foreign matter in the cutting oil blocked by the lip 2.

In addition, in this embodiment, the distance D1 from the one end 2a of the lip 2 to the one end 4a of the outer yoke 4 is larger than the distance D2 from the one end 2a of the lip 2 to the one end 5a of the inner yoke 5. That is, the distance D1 and the distance D2 have a relationship of D1> D2. With such a configuration, it is possible to form a region from the one end 4a of the outer yoke 4 to the position corresponding to the one end 5a of the inner yoke 5 in the area where the outer yoke 4 is not laminated on the one surface 21 of the lip 2. In the range of 211, a step 6 is formed. Since the step 6 functions as a foreign matter accumulation portion, it is possible to cause the foreign matter in the cutting oil trapped by the magnetic force generated between one end 4a of the outer yoke 4 and one end 5a of the inner yoke 5 to accumulate on the step 6. And concentrated. Therefore, according to the seal 1 of this embodiment, the cutting oil and the like containing magnetic foreign matter such as abrasive powder can be blocked by the lip 2, and the end 4 a of the outer yoke 4 and the inner end of the inner yoke 5 can be blocked. The magnetic force generated between the one ends 5 a traps foreign matters in the blocked cutting oil, and the trapped foreign matters can be accumulated on the step 6 and concentrated. As a result, an excellent foreign matter trapping function can be exhibited. In addition, it is possible to reduce a situation in which a foreign object approaches the sealing surface of the lip 2 and to reduce damage to the lip 2 Chance.

The distance D1 from the one end 2a of the lip 2 to the one end 4a of the outer yoke 4 is preferably 2.0 to 10.0 mm, and the distance D2 from the one end 2a of the lip 2 to the one end 5a of the inner yoke 5 is preferably 0.5 to 3.0. mm, and preferably within the above numerical range, the distances D1, D2 have a relationship of D1> D2. The distances D1 and D2 are not limited to the illustrated numerical ranges.

The above-mentioned seal 1 of the present embodiment is obtained by processing fibers impregnated with an elastic material into the shape of the lip 2, and the outer yoke 4 and the inner yoke 5 are laminated on the lip 2, respectively. The magnet 3 is mounted in contact with the other end 4 b of the outer yoke 4 and the other end 5 b of the inner yoke 5.

<Sealing device>

The sealing device 10 of the present embodiment includes the above-described seal 1 of the present embodiment, and the main seal 11 located downstream of the seal 1 with respect to the foreign matter entry direction A. The main seal 11 is a member that seals a liquid such as a cutting oil leaking from the seal 1 and includes at least one lip. The main seal 11 of this embodiment is provided with a first lip portion 12 and a second lip portion 13 in this order from the upstream side with respect to the foreign object entering direction A.

Since the sealing device 10 according to this embodiment is provided with the above-mentioned seal 1 having a magnetic-capturing function, it is possible to capture the first seal having the main seal 11 immediately before the first lip 12 and the second lip 13. The foreign matter having magnetic properties such as abrasive powder that damages the lip 12 and the second lip 13. As a result, it is possible to suppress the first lip portion 12 and the second lip portion 13 from being worn and damaged. In this case, stable sealing can be ensured for a long period of time.

The first lip portion 12 and the second lip portion 13 of this embodiment are made of an elastic material. Examples of the elastic material constituting the first lip 12 and the second lip 13 include the same elastic materials as those exemplified for the lip 2 described above.

In addition, the main seal 11 of the present embodiment further includes a reinforcing member 14 embedded in the main seal 11. The reinforcement 14 is a member that maintains the shape of the main seal 11. Examples of the material constituting the reinforcing member 14 include iron.

In this embodiment, the seal 1 and the main seal 11 are arranged separately from each other. According to this structure, it is possible to suppress the magnetic force of the seal 1 from affecting the reinforcement 14 of the main seal 11. In addition, for example, when the main seal 11 does not include the reinforcement 14, the seal 1 and the main seal 11 may be brought into contact with each other as necessary.

Claims (6)

An industrial seal includes: a plate-shaped lip portion having one end in contact with a portion to be sealed; a magnet; and a plate-shaped outer yoke having one end located at a distance D1 from one end of the lip portion and the other end communicating with And one of the two magnetic poles of the magnet is laminated on one side of the lip; and a plate-shaped inner yoke having one end at a distance D2 from one end of the lip and the other end of the magnet A state in which the other of the magnetic poles is in contact is laminated on the other surface of the lip, and the distance D1 and the distance D2 have a relationship of D1> D2. According to the industrial seal of claim 1, the lip portion is made of a fiber impregnated with an elastic material. The industrial seal according to item 1 of the scope of patent application, wherein the industrial seal has a ring shape. The industrial seal according to item 1 of the scope of patent application, wherein the industrial seal has a magnetic-capturing function. A sealing device includes: the industrial seal described in item 1 of the scope of patent application; and a main seal, which is located downstream of the aforementioned industrial seal with respect to the foreign object entry direction. The sealing device according to item 5 of the scope of patent application, wherein the industrial seal and the main seal are arranged separately from each other.