JPH0557529U - mechanical seal - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent deterioration of the sealing property due to peeling of the adhesive between the elastomer bellows 5, the seal ring 6 and the cartridge case 3. [Structure] Tip fitting part 5 of elastomer bellows 5
a is a back surface 6a of the seal ring 6 and a cylindrical holding portion 6b having an inner diameter thereof, and a holder 1 for holding the tip portion of the spring 4.
0 is compressed in the axial direction and the radial direction, and the rear end fitting portion 5b of the elastomer bellows 5 is compressed between the inner surface of the cartridge case 3 and the holder 11 holding the rear end portion of the spring 4 in the axial direction and It is configured to be compressed in the radial direction.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 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 that is axially biased by the elastomer bellows 5 and maintains airtightness with the cartridge case 3 by the elastomer bellows 5, and a shaft that is inserted in 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 adhesives on the back surface 6a 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 frictional heat and friction torque generated on the sealing sliding surface S, the adhesive peels off under high temperature atmosphere conditions or high speed rotation conditions, and leakage from both ends of the elastomer bellows 5 occurs. There was a risk of this occurring.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent the deterioration of the sealing property due to the peeling of the adhesive between the elastomer bellows, the seal ring and the cartridge case.

[0006]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides, in a cartridge case fixed to a housing, a seal ring that abuts a mating ring on a shaft side, a spring that presses the seal ring against the mating ring, and a seal. In a mechanical seal that incorporates an elastomer bellows that maintains the airtightness between the ring and the cartridge case, the tip fitting part of the elastomer bellows has the back surface of the seal ring and the cylindrical holding part of its inner diameter, and the spring Compressed in the axial and radial directions with the holder that holds the tip, the rear end fitting of the elastomer bellows is located between the inner surface of the cartridge case and the holder that holds the rear end of the spring. It is configured to be compressed in the axial direction and the radial direction.

[0007]

[Action]

 According to the structure of the present invention, the tip fitting portion of the elastomer bellows is axially and radially compressed between the back surface of the sealing ring and the cylindrical holding portion having the inner diameter thereof, and the holder holding the tip portion of the spring. Since it is sandwiched in the state, the airtightness and the fixability between the front end fitting portion and the seal ring are sufficiently secured, and similarly, the rear end fitting portion of the elastomer bellows is connected to the inner surface of the cartridge case. Since it is sandwiched between the holder that holds the rear end of the spring in a compressed state in the axial and radial directions, the airtightness and the fixability between the rear end fitting and the cartridge case are fixed. Is sufficiently secured.

[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 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 diameter portion of the rear surface 6a of the seal ring 6 is provided. The holder 10 is sandwiched in a compressed state by a tightening margin set between the holder 10 and the inner diameter tubular portion 10b.

On the other hand, the rear end fitting portion 5b of the elastomer bellows 5 has a substantially U-shaped cross section, and an annular projection 55 is formed on the back surface of the radial portion 54 of the rear end fitting portion 5b. The inner 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 that holds the rear end portion 4b of the spring 4 are sandwiched in a pressure contact state by the biasing force of the spring 4. Has been done. An annular protrusion 57 is formed on the outer peripheral surface of the outer diameter tubular portion 56 of the rear end fitting portion 5b, and the outer diameter tubular portion 3b of the cartridge case 3 and the holder 11 are formed. It is sandwiched in a compressed state by a tightening margin set between it and the outer diameter tubular portion 11b.

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. The fitting ring 9 has a shape in which a part of the outer peripheral surface 9c of the mating ring 9 is in contact with the tip of the outer diameter portion of the accommodating portion 7a. To be easily discharged to the liquid to be sealed W directly or through the sleeve 7 to improve the cooling efficiency of the sealing sliding surface S.

That is, in the mechanical seal configured as described above, both ends of the elastomer bellows 5 have their fitting portions 5a and 5b provided with a tightening margin in the axial direction and the radial direction by the holders 10 and 11, respectively. It is possible to secure airtightness and fixability between the seal ring 6 and the cartridge case 3 without depending on the adhesive force of the adhesive.

[0013]

[Effect of the device]

 As described above, according to the present invention, the both ends of the elastomer bellows are axially and radially tightened by the holders that hold the both ends of the spring and are crimped to the seal ring and the cartridge case. The airtightness and the fixability between the seal ring and the cartridge case can be secured without depending on the adhesive strength of the adhesive, and a situation such as adhesive peeling due to heat cannot occur.

[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]

 1 Housing 2 Shaft 3 Cartridge Case 4 Spring 5 Elastomer Bellows 5a Tip Fitting Section 5b Rear End Fitting Section 6 Seal Ring 6a Rear Side 6b Cylindrical Holding Section 7 Sleeve 7a Housing Section 9 Mating Ring 10, 11 Holder

Claims (1)

[Scope of utility model registration request] 1. A cartridge ring fixed to a housing, a seal ring that abuts a mating ring on a shaft side, a spring that presses the seal ring against the mating ring, and a seal ring and the cartridge case. In a mechanical seal that incorporates an elastomer bellows that retains the airtightness of the, the tip fitting part of the elastomer bellows is between the back surface of the seal ring and the cylindrical holding part of its inner diameter, and the holder that holds the tip part of the spring. A mechanical seal that is axially and radially compressed, and a rear end fitting portion of an elastomer bellows is axially and radially compressed between an inner surface of a cartridge case and a holder that holds a rear end portion of a spring.