JPS6084480A - Sealing apparatus - Google Patents

Abstract

PURPOSE:To prevent the formation of foams and cracks in a rubber material by constituting the equipment which uses coolant, etc. so as not to be influenced by the sharp variation of pressure in environment. CONSTITUTION:When the equipment stops operation or the pressure inside (a) the equipment sharply reduces because of the sharp lowering of the coolant environment temperature, the flow of the coolant in the annular gap between packings 10 and 16 and O-rings 8 and 15 is cut. Further, the packings 10 and 16 are kept at proper positions by the transfer suppressing means such as a snap ring 12, the inner peripheral part 24 of a spring support 19, etc. Therefore, the sharp variation of pressure for the O-rings 8 and 15 made of rubber can be avoided, and the formation of foams, cracks, etc. is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image fence device for collecting cold water.

Conventionally, various types of sealing devices such as rubber O-rings and backings have been used in equipment that uses refrigerants, such as various near-conditioning devices, refrigerant machines, and other systems. The material is selected in consideration of the type of refrigerant and lubricant used in each system, the combination of ambient temperature, etc. For example, for high temperature atmospheres, special fluoro rubber material is Freon R-22 (C
Neoprene rubber is used for low-temperature atmospheres such as HClF2). However, in recent years, the refrigerant atmosphere conditions in which various rubber members are arranged have become stricter due to changes in 7 Leon gas, increases in ambient temperature, pressure fluctuations within the system, etc. in order to improve the efficiency and save resources of Punpuntsusa and the like. Additionally, the refrigerant is a highly permeable gas and easily permeates into the rubber material, causing deterioration of the rubber material. For example, deterioration phenomena of rubber materials immersed in refrigerant liquid include hardening, shrinkage, swelling, foaming, and cracking (foaming and cracking are the ones that fatally destroy the sealing function). On the other hand, the reality is that there is currently no rubber material that has the four resistances of heat resistance, oil resistance, refrigerant resistance, and sealing resistance, and the rubber material is used at a compromise with respect to any of the above resistances. In view of the above-mentioned current situation, the present inventor investigated the particularly important mechanism of foaming and cracking, and found that the main cause of foaming and cracking caused by rubber refrigerants is swelling of rubber materials caused by refrigerants and lubricating oil. We have confirmed that this occurs when rapid pressure fluctuations in the rubber enclosure are combined with deterioration phenomena such as shrinkage.

In view of the above points, the present invention provides equipment that uses refrigerants, etc., so that the rubber material is not affected by sudden pressure fluctuations in the atmosphere, and prevents foaming and cracking of the rubber material. The present invention provides a sealing device that enables the use of heat-resistant rubber materials. That is, the sealing device of the present invention is a refrigerant sealing device for equipment that uses a refrigerant, and a rubber O-ring or a backing made of rubber or synthetic resin with excellent oil resistance and refrigerant resistance is attached to the front surface of the refrigerant side of the backing. In order to prevent the O-ring, backing, or gasket from moving due to pressure fluctuations of the refrigerant, a movement preventing means such as a snap ring or a spring restraint is provided on the front surface of these members on the refrigerant side. It is characterized by becoming.

Hereinafter, embodiments of the present invention will be described according to the drawings.
In Figure 1, (1) is a mechanical seal used in compressors of equipment that uses refrigerant, and is a fixed seal that is inserted into a shaft hole (3) formed in the housing (2) of the equipment. The sliding contact between the side sliding body (4) and the rotating side sliding body (6), which is externally fitted onto the rotating shaft (5) of the device inserted into the shaft hole (3), causes the inside of the device (a) to This is intended to prevent the enclosed refrigerant and lubricating oil from leaking to the outside. An annular groove (7) is formed on the outer peripheral surface of the fixed side sliding body (4), and a rubber groove is formed in the groove (7) to seal between the fixed side sliding body (4) and the housing (2). An O-ring (8) is fitted therein, and an annular step (9) is formed at the refrigerant side end of the outer peripheral surface, and a pressure receiving surface (
11) with the backing (
10) is fitted. This backing (10) is made of a synthetic resin with excellent oil resistance and refrigerant resistance. (12) is a snap ring fitted to the inner peripheral surface of the shaft hole (3) of the housing (2) at a position further toward the refrigerant side of the backing (10). The rotating side hdm body (
6) is formed with two annular step portions (13) and (14) on the refrigerant side, and a step portion (13) on the back side,
The rubber O-ring (15) that seals between the rotating side sliding body (6) and the rotating shaft (5) is still attached to the refrigerant side step part (14).
) is fitted with a backing (16) with its pressure receiving surface (17) facing toward the O-ring (15). This backing (16) is made of synthetic resin with excellent oil resistance and refrigerant resistance. Further, a restraining ring (18) is fitted in the latter step (14) at a position on the O-ring (15) side of the backing (16). (19
) is a spring retainer with a substantially L-shaped cut surface disposed on the refrigerant side of the rotating side sliding body (6), and its outer peripheral edge (
Flanges (21) extending in the axial direction from 20) are formed in three equally spaced shapes in the circumferential direction, and the collars (21) are formed in three equally spaced shapes on the outer peripheral surface of the rotating n-+tl sliding body (6). Engagement groove (22)
The distal end (23) thereof is bent in the inner diameter direction and fixed to the rotary side sliding body (6) by caulking.

The inner circumferential portion (24) of the spring retainer (19) is located on the inner diameter of the circumferential wall of the annular step (14) of the rotating side sliding body (6), and is axially oriented with respect to the backing (16). (25) is a half-cut cross-section shaped case fitted on the rotating shaft (5), and a collar (27) extending in the axial direction from the outer diameter cylinder part (26) is attached to the circumference. The flange (27) is engaged with the retaining grooves (28) formed in the outer peripheral surface of the rotating side sliding body (6) in a three-equally spaced pattern, and the rotation It serves as a rotation stopper for the side sliding body (6).The engagement groove (28) in which the collar (27) of this case (25) engages and the collar (19) of the spring retainer (19)
As shown in FIG. 2, the retaining groove (22) with which the retaining groove 21) engages is formed to be offset by 60 degrees. Also a case (25
) The tip of the collar (27) protrudes from the retaining groove (28) and is widened in the circumferential direction to form a substantially T-shape. (29) is a coil spring interposed between the case (25) and the spring retainer (19).

When the pressure of the refrigerant sealed in the interior (a) of the container increases for the mechanical seal (1) having the above structure, the refrigerant pushes and spreads the backings (10) and (16). (1,6) and the O-ring (8
The pressure will be increased to approximately the same as a). After that, the inside of the equipment (
If the pressure in a) suddenly decreases, the backing (10)
(16) and the O-ring (8X15), the pressure receiving surface (
11) (17) is directed toward the annular gap to block the flow of refrigerant, thereby preventing a sudden pressure drop. Therefore, a rubber O-ring (8x15)
Since encountering sudden pressure fluctuations is avoided, there is no risk of foaming or cracking, and at the same time, heat-resistant rubber can be used. Also in this case, backing Q
A pressure difference occurs between the annular gap and the inside of the device (a) with OX16) as a boundary, which makes the former high pressure, and depending on the fit, the backing (10×16) moves toward the inside of the device (a) or toward the inside of the device (a). A pushing force acts, but the inner circumference (24) of the snap ring (12) and spring retainer (19)
The backing (10) (16) is
) can be maintained in a proper fitted position, and the above-mentioned operation can be maintained even if pressure fluctuations are repeated.

During this pressure fluctuation, the holding ring (18) closes the O ring (15).
) is prevented from moving in the direction of the backing (16).

The banks (10) and (16) are intended to prevent sudden pressure build-up as described above, and may be made of a material with excellent refrigerant and oil resistance, such as Teflon. A sufficient, positive sealing function is not necessarily required. In addition, a mechanical seal with the above configuration (1
) can be modified in various ways as exemplified below.

(2) As shown in Fig. 3, the spring retainer (19) is divided into two parts (19a) and (19b).

@As shown in Figures 4 and 5, rotate the collar (21) of the spring retainer (19) and rotate the sliding body (6).
Instead of caulking and fixing the collar (21) to the case (
Like the collar (27) of item 25), it is formed into a substantially T-shape and is engaged with the engagement groove (22).

θ As shown in Fig. 2, the flanges (21x27) of the spring retainer (19) and the case (25) are formed in three equal distances, and the flanges (21) and (27) are also formed in three equal distances. In contrast to the engagement groove (22028), the equal distribution number is changed to 2 or 4 or more.

As explained above, the sealing device of the present invention is made of rubber Q
Since a combination of rubber or synthetic resin backing or Teflon gasket, which has excellent oil and refrigerant resistance, is attached to the front surface of the IJ ring or backing on the refrigerant side, the refrigerant does not reach the rubber O-ring or banking. It is possible to prevent the deterioration of rubber materials under the influence of pressure fluctuations, especially the occurrence of foaming and cracking that destroys the sealing function.
For example, Freon R, which has traditionally been used as a refrigerant,
It becomes possible to use heat-resistant fluororubber etc. for -22. Furthermore, in addition to expanding the selection range of rubber materials that have traditionally been selected at the expense of heat resistance, oil resistance, refrigerant resistance, or sealing resistance in the sealed side devices of various compressors, mechanical seals as explained in the above embodiments have been added. It has features such as being able to be used not only as a rotating sealing device as typified by the above, but also as a fixed sealing device, and furthermore, it is equipped with the above-mentioned movement prevention means for O-rings, etc., so it can be used continuously as it is against pressure fluctuations due to deformation. However, the present invention is highly effective as a refrigerant sealing device.

[Brief explanation of drawings]

Fig. 1 is a front cross-sectional view of a mechanical seal according to an embodiment of the present invention, Fig. 2 is a left side view of various rotating parts, and Figs. 3 and 4 are main part front views showing different modifications. The sectional view, FIG. 5, is a view taken along the line A in FIG. 4. (1,) Mechanical seal (2) Housing (3) Shaft hole (4) Fixed side sliding body (5) Rotating shaft (6) Rotating side sliding body (8X15) O-ring (9X13) (14) Annular step (10 ) (16) Backing (11) (17) Pressure receiving surface (12) Snap ring (18) Retaining ring (
19) Spring retainer (21X27) Tsuba (22828
) Engagement groove (24) Spring retainer inner circumference (25) Case (29) Coil spring

Claims (1)

[Claims] In a refrigerant sealing device for equipment that uses refrigerant, a rubber or synthetic resin backing or Teflon gasket with excellent oil resistance and refrigerant resistance is attached to the front surface of the rubber O-ring or backing on the refrigerant side, and In order to prevent the O-ring, backing, or gasket from moving due to pressure fluctuations in the refrigerant, a sealing device is provided with movement prevention means such as a snagging ring or a snagging ring restraint on the front surface of these members on the refrigerant side.