JPH0229318Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to the structure of a mechanical seal that seals the rotating shaft of a machine such as a hot water circulation pump or a domestic well water pump.

[Conventional technology]

Generally, in a pump such as a hot water circulation pump, an impeller B provided in a housing of a pump head A of the machine body is connected to a rotating shaft D inserted from a drive system C into the housing of the machine body, as shown in FIG. In addition to being driven to rotate, the insertion portion of the rotating shaft D is sealed with a mechanical seal E.

Conventionally, in this type of mechanical seal,
As illustrated in FIG. 3, when sealing the rotating shaft 2 inserted into the housing 1 of the aircraft body, a floating sheet 3, which is a fixed side shaft sealing mechanism, is placed on the housing 1 side via a cushioning rubber 4. While fitting and fixing, a seal ring 5, which is a rotation-side shaft sealing mechanism, is arranged on the rotating shaft 2 side, and the outer circumference of the seal ring 5 is baked and held by a packing 6, so that its sliding surface 5a is Sliding surface 3 of floating sheet 3
Then, the outer periphery of the end of the packing 6 is fixed to the periphery of the rotating shaft 2 with a garter spring 7, and the seal ring 5 is attached to the floating seat 3 by the biasing force of the coil spring 8. It has an assembly structure in which the coil spring 8 is pressed toward the side in the axial direction and is sealed by backing up the coil spring 8 with a collar 9 fixed to the periphery of the rotating shaft 2.

[Problem that the invention attempts to solve]

However, in such conventionally structured mechanical seals, the assembly components of the fixed shaft sealing mechanism and the rotating shaft sealing mechanism that make up the seal portion are individually independent, making assembly work difficult. This is extremely troublesome and also tends to result in insufficient maintenance of each component to be assembled. Therefore, during assembly, foreign matter such as dirt or dirt may adhere to the sliding surface of the seal part, chipping, etc.
Not only do many defects such as scratches or poor fitting occur, but it is also necessary for the user to improve maintenance management and assembly accuracy such as perpendicularity, parallelism, and installation length during assembly. It's difficult to expect so. Further, the coil spring 8 constituting the rotating side shaft sealing mechanism is prevented from rotating by fixing its one end 8a to a collar 9 that backs up the opposite side of the seal ring 5. The coil spring 8 is twisted by the sliding torque with the seal ring 5, and a torsional repulsive force is constantly accumulated in the circumferential direction, resulting in problems such as squeaking due to the stick-slip phenomenon and breakage of the spring due to repeated stress. There were various problems that caused this.

[Purpose of invention]

The present invention was developed under the above circumstances, and its purpose is to integrate each seal component into a unit that can be easily assembled, and to prevent sliding due to sliding torque. To provide a mechanical seal that can reliably prevent the occurrence of noise on a moving surface and breakage of a coil spring.

[Means for solving problems]

In order to solve the above-mentioned problems, the mechanical seal of the present invention has a rotating side shaft sealing mechanism attached to the shaft periphery via a sleeve having a rotation prevention mechanism with the rotating side shaft sealing mechanism, and the sleeve To,
A flange is provided to hold the stationary side shaft sealing mechanism integrally with the rotating side shaft sealing mechanism when not installed, and the flange is configured to closely face the end surface of the housing.

[Effect]

That is, the present invention has the above-mentioned configuration, whereby the rotating side shaft sealing mechanism and the stationary side shaft sealing mechanism are integrally assembled and supported via the sleeve, and the rotating side shaft sealing mechanism and the stationary side shaft sealing mechanism are integrally assembled and supported through the sleeve. Since a rotation prevention mechanism is provided between the seal ring and sleeve of the mechanism to prevent relative rotation, it is easy for the user to maintain and manage the seal components during assembly. This makes assembly work easier, and since no sliding torque acts on the coil spring that presses the seal ring toward the floating seat, no torsional repulsive force in the circumferential direction accumulates. Not done. The flange formed on the sleeve closely opposes the end face of the housing when the sleeve is attached to the shaft circumference, forming a kind of labyrinth seal, so foreign particles from the outside do not reach the sliding surfaces of the seal ring and floating seat. It has the effect of preventing the intrusion of

〔Example〕

The present invention will be explained below with reference to an embodiment shown in FIG. In the illustrated embodiment of the present invention, the same reference numerals are used for the parts having the same structure as the conventional mechanical seal shown in FIGS. 2 and 3, and the explanation thereof will be omitted.

That is, as shown in FIG. 1, the present invention combines a fixed-side shaft sealing mechanism consisting of a floating sheet 3 and a buffer rubber 4 fixed to the housing 1 side with a seal ring 5 fixed to the rotating shaft 2 side, A sleeve 10, in which a rotating side shaft sealing mechanism consisting of a gasket 6, a garter spring 7 and a coil spring 8 is assembled, is integrally formed by a flange 10a formed at the end of the stationary side shaft sealing mechanism protruding toward the rear side. The seal ring 5 of the rotary side shaft seal mechanism is assembled and supported into a unit, and a recess 51 is formed in the inner diameter part of the seal ring 5 of the rotary side shaft seal mechanism.
On the other hand, a protrusion 11 is provided protrudingly on the outer diameter part of the sleeve 10 corresponding to the recess 51, and the recess 51 and the protrusion 11 are engaged with each other to form a rotation prevention mechanism. The sleeve 10 is designed to prevent rotation between the seal ring 5 and the sleeve 11, and when assembled, the sleeve 10 is placed so that its flange 10a closely faces the end surface 1a of the housing 1 to form a labyrinth seal. The floating sheet 3 of the stationary side shaft sealing mechanism is fitted and fixed to the housing 1 side via the buffer rubber 4, thereby being assembled. It is something.

Note that the present invention is not limited to the above-described embodiments, and for example, instead of the packing 6 attached to the periphery of the rotating shaft 2 via the garter spring 7,
It goes without saying that an O-ring may be used and that various modifications can be made without departing from the gist of the present invention.

[Effect of idea]

As is clear from the above description, according to the present invention, the rotating side shaft sealing mechanism and the stationary side shaft sealing mechanism are integrally assembled and supported via a sleeve to form a unit, and the rotating side shaft sealing mechanism Since a rotation prevention mechanism is provided between the seal ring and the sleeve to prevent relative rotation, it is easy for the user to maintain and manage the seal components during assembly. Assembling work is easy, and since no sliding torque is applied to the coil spring that presses the seal ring toward the floating seat, noise and breakage can be reliably prevented. The flange that holds the rotating shaft sealing mechanism on the sleeve forms a labyrinth seal when the sleeve is installed, and prevents foreign matter from entering the sliding surfaces of the seal ring and floating seat. So the seal can be troweled to improve durability.

[Brief explanation of the drawing]

Fig. 1 is a schematic enlarged cross-sectional view of essential parts showing an embodiment of the mechanical seal according to the present invention, and Fig. 2 is an explanation showing a partially cutaway cross-section of the shaft seal of a pump equipped with a conventional mechanical seal. 3 are schematic enlarged cross-sectional views of the main parts of a conventional mechanical seal in section A of FIG. 2. DESCRIPTION OF SYMBOLS 1... Housing, 2... Rotating shaft, 3... Floating seat, 4... Buffer rubber, 5... Seal ring, 6... Packing, 8... Coil spring, 10... Sleeve, 51, 11... ...Rotation stop mechanism.

Claims (1)

[Scope of utility model registration request] A fixed side shaft sealing mechanism consisting of a floating sheet fixed to the housing side via a buffer rubber around the circumference of a rotating shaft inserted into the housing of the aircraft, and a fixed side shaft sealing mechanism consisting of a floating sheet fixed to the rotating shaft side via a packing or an O ring. A mechanical seal is provided with a rotating side shaft sealing mechanism consisting of a seal ring that is fixed to the rotating side shaft, and the seal ring is urged in the axial direction by a coil spring and brought into sliding contact with the floating seat. A sealing mechanism is attached to the periphery of the shaft via a sleeve having a rotation preventing mechanism with respect to the rotating side shaft sealing mechanism, and the stationary side shaft sealing mechanism when not attached is connected to the rotating side shaft sealing mechanism on the sleeve. a flange held together with the flange;
A mechanical seal, characterized in that it closely faces an end face of the housing.