JPH0596640U - mechanical seal - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain an excellent sealability between the elastomer bellows 5, the seal ring 6 and the cartridge case 3. [Structure] Tip fitting part 5 of elastomer bellows 5
a The cylindrical holding portion 6b of the seal ring 6 and the holder 10
A first projection 53 that is radially compressed between the holder 11 and the cartridge case 3 rear end wall 3b in the axial direction on the back surface of the rear end fitting portion 5b of the elastomer bellows 5. A second protrusion 55 that is compressed to
At the outer diameter end of the rear end fitting portion 5b, a ridge portion 57 extending toward the seal ring 6 and protrudingly provided on the outer peripheral surface of the rear end fitting portion 5b is provided with an annular lip 56 that presses against the inner peripheral surface of the outer diameter cylindrical portion 3b of the cartridge case 3b. Set up.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a mechanical seal that seals the circumference of the rotating shaft of a device, and in particular, has a structure in which a non-rotating seal ring is held in a cartridge case and an elastomer bellows is sealed between the seal ring and the cartridge case. The present invention relates to a cartridge type mechanical seal.

[0002]

[Prior Art]

 BACKGROUND ART Conventionally, as a mechanical seal that seals the circumference of a cooling water pump of an automobile engine, for example, a cartridge-type mechanical seal in which a rotating side and a stationary side parts are integrated as shown in FIG. 2 is known. There is. In the figure, 1 is a housing for a shaft sealing portion of a cooling water pump, and 2 is a shaft which is inserted into the housing 1 and driven by a pulley (not shown) to rotate an impeller.

The mechanical seal is supported by an annular cartridge case 3 that is tightly fitted in the opening of the shaft hole of the housing 1, an axially movable and non-rotatable state in the cartridge case 3, and a spring. 4. A non-rotating seal ring 6 which is axially urged by 4 and maintains airtightness with the cartridge case 3 by an elastomer bellows 5, and a shaft in a state where the seal ring 6 is inserted into the inner circumference of the cartridge case 3. 2 is provided with a sleeve 7 and a mating ring 9 held via a cup gasket 8 in a collar-shaped accommodating portion 7a formed at the end of the sleeve 7 on the seal ring 6 side, The mating ring 9 that rotates integrally with the shaft 2 and the non-rotating seal ring 6 that axially faces the mating ring 9 act on the biasing force of the spring 4. Therefore, it is in airtight sliding contact, and at the hermetically sliding surface S, the liquid W to be sealed in the pump chamber on the outer peripheral side thereof is prevented from leaking to the atmosphere A side (bearing side).

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional mechanical seal, the front end fitting portion 5a and the rear end fitting portion 5b of the elastomer bellows 5 have the adhesive B on the back surface of the seal ring 6 and the inner surface of the rear end wall 3a of the cartridge case 3, respectively. Since they are adhered, due to the friction heat and friction torque generated on the sealing sliding surface S, the adhesion may be peeled off under high temperature atmosphere conditions or high speed rotation conditions, and leakage may occur from both ends of the elastomer bellows 5. was there.

The present invention has been made in view of the above points, and an object of the present invention is to obtain excellent sealability between the elastomer bellows, the seal ring, and the cartridge case.

[0006]

[Means for Solving the Problems]

 The above-mentioned conventional technical problems can be effectively solved by the present invention. That is, the mechanical seal according to the present invention is provided with a protrusion on the inner diameter of the tip portion of the elastomer bellows, and is radially compressed between the cylindrical holding portion having the inner diameter of the rear end of the seal ring and the holder holding the tip portion of the spring. Between the annular first projection and the holder that holds the rear end of the spring protruding from the rear surface of the rear end fit portion of the elastomer bellows and the rear end wall of the cartridge case in the axial direction. The ring-shaped second protrusion that is compressed to the outside and the peak portion that extends from the outer diameter end of the rear end fitting portion toward the seal ring and is protruded on the outer peripheral surface of the rear end fitting portion is the outer diameter of the cartridge case. The tubular portion has an annular lip that is pressed against the inner peripheral surface of the tubular portion.

[0007]

[Action]

 According to the configuration of the present invention, in the tip fitting portion of the elastomer bellows, the first protrusion protruding from the inner diameter of the elastomer bellows is pressed against the tubular holding portion of the inner diameter of the rear end of the seal ring in a radially compressed state. Thus, the airtightness and the fixability with the seal ring are sufficiently secured. On the other hand, the second protrusion protruding from the rear surface of the rear end fitting portion of the elastomer bellows presses against the inner surface of the rear end wall of the cartridge case with the axial biasing force of the spring, and The peak of the outer circumference of the annular lip provided on the outer diameter side is brought into pressure contact with the inner circumferential surface of the outer cylindrical portion of the cartridge case by the pressure of the liquid to be sealed, so that the airtightness and the fixability with the cartridge case are secured. Secure enough.

[0008]

【Example】

 FIG. 1 shows an embodiment of the present invention. The same or corresponding portions as those of the conventional example shown in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted.

That is, in this mechanical seal, the tip fitting portion 5 a of the elastomer bellows 5 has a substantially L-shaped cross section, and the radial portion 51 of the tip fitting portion 5 a includes the back surface 6 a of the seal ring 6 and the spring 4. It is sandwiched in a pressure contact state by the urging force of the spring 4 with the radial portion 10a of the holder 10 having an L-shaped cross section that holds the tip portion 4a. An annular first protrusion 53 is formed on the inner peripheral surface of the inner diameter cylindrical portion 52 of the tip fitting portion 5a, and a cylindrical holding portion 6b protruding from the inner surface of the rear surface 6a of the seal ring 6 is formed. And the inner diameter cylindrical portion 10b of the holder 10 are clamped in a compressed state by a tightening margin set.

On the other hand, the rear end fitting portion 5b of the elastomer bellows 5 also has a substantially L-shaped cross section, and an annular second protrusion 55 is formed on the rear surface of the radial portion 54 of the rear end fitting portion 5b. Between the inner side surface of the rear end wall 3a of the cartridge case 3 and the radial portion 11a of the holder 11 having a substantially U-shaped cross section for holding the rear end portion 4b of the spring 4 by the urging force of the spring 4. It is clamped in a pressed state. An annular lip 56 extends in the axial direction from the outer diameter end of the rear end fitting portion 5b toward the seal ring 6 side, and a ridge 57 projectingly provided on the outer peripheral surface on the tip end side thereof is formed in the cartridge. It is in close contact with the inner peripheral surface of the outer diameter tubular portion 3b of the case 3.

Further, in this embodiment, the mating ring 9 is hermetically sealed in the housing portion 7a formed at one end of the sleeve 7 via the gasket 12 that covers the inner diameter side of the back surface 9a and the inner peripheral surface 9b. With the structure in which the outer diameter side portion of the mating ring 9 is opened into the liquid W (water) to be sealed, the heat generated on the sealing sliding surface S is transferred from the measuring ring 9 to the liquid to be sealed. The cooling efficiency of the sealing sliding surface S 1 is improved by facilitating the release to W. Further, the inner diameter portion 12a of the gasket 12 interposed between the inner peripheral surface 9b of the mating ring 9 and the sleeve 7 has a tapered shape in which the inner peripheral surface becomes larger in diameter toward the accommodation portion 7a. By forming it in the shape described above, press fitting into the container portion 7a in a combined state with the mating ring 9 is facilitated.

That is, the mechanical seal having the above-described structure is configured such that the first and second protrusions 53 and 55 formed on the both end fittings 5 a and 5 b of the elastomer bellows 5 are appropriately compressed and the seal ring 6 and the cartridge case It is to be crimped to 3. Here, the first protrusion 53 is provided with sufficient crimping force and sealing performance by the tightening margin set between the tubular holding portion 6b of the seal ring 6 and the inner diameter tubular portion 10b of the holder 10. On the other hand, since the tightening margin of the second protrusion 55 depends on the axial pressing force of the coil spring 4, its own crimping force is smaller than that of the first protrusion 53. However, the annular lip portion 56 located on the outer diameter side of the cartridge case 3 is appropriately crushed by the pressure of the liquid W to be sealed so that the peak portion 57 of the outer diameter shown by the broken line in the drawing is appropriately crushed. Since it is pressed against the outer diameter cylindrical portion 3b, it is possible to sufficiently compensate for the insufficient pressure bonding force in the second protrusion 55.

Further, the sealing property of the rear end fitting portion 5b of the elastomer bellows 5 is determined by the fact that the rear end fitting portion 5b is provided between the inner diameter cylindrical portion 11b of the holder 11 and the rear end inner diameter cylindrical portion 3c of the cartridge case 3. Unlike the case where it is obtained by giving a tightening margin to the axial portion 58 of the inner diameter, the work of pressing the rear end fitting portion 5b toward the rear end wall 3a of the cartridge case 3 at the time of assembly is unnecessary. Therefore, it is not necessary to apply alcohol to the rear end fitting portion 5b for facilitating press-fitting, and no adhesive is used, so that the number of assembling steps can be reduced.

[0014]

[Effect of the device]

 In the mechanical seal of the present invention, the first protrusion protruding from the inner diameter of the fit portion of the elastomer bellows is pressed against the cylindrical holding portion having the inner diameter of the rear end of the seal ring, and is protruded from the rear surface of the rear fit portion. The second protrusion is pressed against the inner surface of the rear end wall of the cartridge case by the axial urging force of the spring, and the peak of the outer periphery of the annular lip provided on the outer diameter side of the rear end fitting is to be sealed. By making pressure contact with the inner peripheral surface of the outer cylindrical portion of the cartridge case by the pressure of the liquid, sufficient airtightness and fixing property with the cartridge case are secured, so that the elastomer bellows and the seal ring and Not only the cartridge case does not need to be adhered, but also a sufficient sealing property of the annular lip portion due to the liquid pressure to be sealed can be expected, and the rear end filter to the cartridge case can be expected. Since the press-fitting operation of the isolation portion is unnecessary, the effect that Tsu had the assembly is easy.

[Brief description of drawings]

FIG. 1 shows an embodiment of a mechanical seal according to the present invention,
It is a half cross-sectional view shown in relation to a device to be mounted.

FIG. 2 is a half cross-sectional view showing an example of a conventional mechanical seal in relation to an attached device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Shaft 3 Cartridge case 4 Spring 5 Elastomer bellows 5a Tip fitting part 5b Rear end fitting part 53 First protrusion 55 Second protrusion 56 Annular lip 57 Ridge 6 Seal ring 6a Rear face 6b Cylindrical holding part 7 Sleeve 7a Storage part 9 Mating ring 10, 11 Holder

Claims (1)

[Scope of utility model registration request] 1. A cartridge ring fixed to a housing, comprising: a seal ring that abuts a mating ring on a shaft side; a spring that presses the seal ring against the mating ring; and the seal ring and the cartridge case. A mechanical seal in which an elastomer bellows for maintaining airtightness is incorporated, which holds a cylindrical holding portion having a rear inner diameter of the seal ring and a distal end portion of the spring, which is protruded from an inner diameter of a tip fitting portion of the elastomer bellows. An annular first protrusion that is radially compressed between the holder, a holder protruding from the rear surface of the rear end fitting portion of the elastomer bellows and holding the rear end of the spring, and the rear of the cartridge case. An annular second protrusion that is axially compressed between the end wall and the rear end flap; An annular lip that extends from the outer diameter end of the wit portion toward the seal ring side and that projects on the outer peripheral surface thereof is in pressure contact with the inner peripheral surface of the outer diameter cylindrical portion of the cartridge case. And mechanical seal.