JPS60143275A - Supporting ring of fixed seal ring in mechanical seal - Google Patents

Abstract

PURPOSE:To prevent a fixed seal ring from jumping out, by removably mounting a supporing ring to an engagement recessed part provided to be cut in the opening end of a hollowed part, inscribing the fixed seal ring to be fitted, in a housing. CONSTITUTION:An engagement recessed part 1b is provided to be cut in the opening end part of an internal peripheral surface 1a, to which a fixed seal ring 2 is inscribed and fitted, of a housing. Then this engagement recessed part 1b removably fits a supporting ring 9 to be fixed forming it by integral molding to an external diameter larger than the external diameter of the fixed seal ring 2 further with an internal diameter smaller than the external diameter of the fixed seal ring 2. In this way, any wide space is not required for mounting the supporting ring 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support ring for a fixed seal ring of a mechanical seal, and more particularly to a support ring for a fixed seal ring of a mechanical seal, and more specifically, a support ring for a fixed seal ring of a mechanical seal, and more specifically, a support ring for a fixed seal ring, and more specifically, a support ring for supporting a fixed seal ring of a mechanical seal. It is an object of the present invention to provide a support ring that is easy to install and functions effectively in order to prevent a fixed seal ring from popping out due to reverse pressure in an image pressure type mechanical seal.

In general, Lucille, a mechanic related to shaft sealing technology,
The structures shown in FIGS. 1 to 3 are commonly used. Namely, a fixed seal ring (2) is fitted internally into a recess in the housing (1) of the device body, and a rotating seal ring (4) driven by a rotating shaft (3) inserted through the fixed seal ring (2). and the fixed seal ring (2)
Fluid leakage is prevented by sliding between the housing (1) and the rotary seal ring (4), and the sealing between the housing (1) and the fixed seal ring (2) is ensured by the outer peripheral surface of the fixed seal ring (2a ) is maintained by an O-ring (5) fitted into an O-ring groove (2b) formed in the housing inner peripheral surface (1a). A back end surface image pressure type mechanical seal having the above configuration and used under conditions where the pressure applied to the inside (A) of the device to which the mechanical seal is installed is lower than the pressure applied to the outside (B). teeth,
Because a reverse pressure acts on the fixed seal ring (2) in the direction from the (B) to the (A) due to the pressure difference,
There is a problem in that the fixed seal ring (2) protrudes from the recess in the housing (1) into which it is internally fitted. Conventionally, as a device to prevent the fixed seal ring (2) from popping out and support it, there is a method for attaching the washer (7) to the right end face of the housing (for one person) by holding the button #) (6) (see Figure 1). , ■ A method of carving a snap ring groove (1b) in the middle part of the inner peripheral surface (1a) of the housing and fitting the snap ring (8) into the snap ring groove (1b) (see Figure 2). It is commonly used. However, regarding method (2), as shown in Figure 1, mounting the washer (6) requires a large space on the right end surface of the housing (for one person), and depending on the equipment used, it may be difficult to install the washer (6). Attaching the washer (6) may be difficult. Regarding method (2), there is a difficulty in fitting the O-ring (5).

That is, as shown in FIG. 2, the O-ring (5) is
When moving and fitting the fixed seal ring (2) in the direction of (A) to (B) while placing it in the J tongue groove 2b), the elastic restoring force of the 01 and 1 rings (5) ,
The 0 ring (5) falls into the snap ring groove (1b), making it difficult to attach the KO ring (5).

Furthermore, play occurs due to dimensional errors between the plate thickness of the snap ring (8) and the groove width of the snap ring groove (1b). Even if there is no dimensional error in the contact distance between the fixed seal ring and the fixed seal ring, it is difficult to obtain stable sealing performance because the fixed seal ring moves in the axial direction due to back pressure.

SUMMARY OF THE INVENTION In view of the drawbacks associated with the prior art described above, the present invention aims to provide a support ring as a support device for a stationary seal ring that effectively solves the problems.

Hereinafter, embodiments of the present invention will be described according to the drawings.
FIG. 3 is a half-cut sectional view showing a state in which a support ring (9) of a fixed seal ring according to an embodiment of the present invention is attached together with a mechanical seal.

In the same figure, an engaging recess (1
b) is carved, the outer diameter of the engagement recess (1b) is larger than the outer diameter of the fixed seal ring (2), and the inner diameter is larger than the outer diameter of the fixed seal ring (2). ) An integrally molded support ring (9) having a diameter smaller than the outer diameter of the support ring (9) is removably fitted and fixed. Here, the support ring (9
) is designed to come into contact with the housing (1) but not directly with the fixed seal ring, and is made of a material that has the same or similar coefficient of thermal expansion as the material of the housing (1). Constructed to prevent extraction due to heat load. Note that if a pull-out groove (9a) as shown in FIG. 3 is carved on the outer peripheral surface of the support ring (9), the pull-out groove (9a) can be used to remove the support ring (9) during disassembly.
9), it is very convenient. According to this embodiment having the above structure, unlike the conventional example shown in FIG. does not cause Furthermore, in this embodiment, unlike the conventional example shown in FIG. It is easy to attach the O-ring (5). Furthermore, when providing the engaging recess (1b), the four engaging parts (Ib) -
1: If the dimensional accuracy of both is ensured so that the distance at Movement is minimized and sealing performance is stabilized.

As explained above, according to the present invention, the fixed seal ring of the mechanical seal is removably fitted and fixed in the engagement recess carved in the open end of the recess in the housing into which it is internally fitted. , a support ring that is integrally molded with an outer diameter larger than the outer diameter of the fixed seal ring and an inner diameter J-diameter than the outer diameter of the fixed seal ring can be easily and only installed with a space, and can effectively prevent the fixed seal ring from popping out;
As a result, the sealing performance of the mechanical seal can be stabilized, and this effect is significantly superior to that of the prior art.

[Brief explanation of the drawing]

1 and 2 are half-cut cross-sectional views showing how the fixed seal ring support device is installed according to the prior art, and FIG. It is a half-cut sectional view showing a state. (1) Housing (1a) Housing inner surface (1b)
Engagement recess (2) Fixed seal ring (2a) Fixed seal ring outer circumferential surface (2b) O! J groove (3) Rotating shaft
(4) Rotating seal ring (5) O-ring (9) Support ring (9a) Pull-out groove Patent applicant: Eagle Industry Co., Ltd. Patent attorney Representative Yo Nomoto Figure 1

Claims (1)

[Claims] The fixed seal ring of the mechanical seal is removably fitted into and fixed to the engagement recess carved in the open end of the recess in the housing into which it is internally fitted, and is designed to prevent the fixed seal ring from popping out. A support ring for a mechanical seal fixed seal ring integrally formed with an outer diameter larger than the outer diameter of the fixed seal ring and an inner diameter smaller than the outer diameter of the fixed seal ring.