JPH0529585Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a combination ring that can be used as a seal ring for refrigerators, etc.

Conventional technology Consists of a ring body made of synthetic resin, a thin plate-shaped expander in contact with the inner peripheral surface of the ring body, and a coil-shaped expander that applies tension outward in the radial direction to the expander and the ring body. A combination seal ring is known as disclosed in Japanese Utility Model Publication No. 39-36049. A known combination seal ring has an annular first seal in the center of the inner peripheral surface of the ring body.
A recess is provided in the thin plate expander, and a second recess that matches the recess is provided in the thin plate expander, and the coiled expander is disposed in this second recess. In this case, the thin plate-shaped expander has self-tension, has an abutment consisting of end surfaces facing each other, and the width of both depressions is approximately one-fifth of the width of the ring body, and the coil-shaped expander The diameter of the recess is also selected to be somewhat larger than the width of the recess.

Problems to be Solved by the Present Invention Conventional combination seal rings with such a configuration require a high pressure on the coiled expander in order to ensure a relatively high contact pressure on the sliding surface of the ring body to the inner peripheral surface of the cylinder. It provides self-tension. For this reason,
During assembly, the coiled expander may not fit into the recess in the specified position, or the coiled expander may come off from the recess due to vibrations during high-speed operation, and the coiled expander may not fit inside the ring groove. This causes problems such as meandering and not applying tension to the ring body, resulting in a significant decrease in sealing performance.

In addition, in the conventional combination seal ring, the gap size of the thin plate expander increases as the outer circumferential sliding surface of the ring body is worn, and the coil of the coiled expander enters this gap, causing the coiled expander to expand. This may cause problems such as damage to the expander, or failure of the diameter of the thin plate and coil expander to follow the wear of the outer peripheral surface of the ring body, resulting in a reduction in sealing pressure.

Therefore, the problem to be solved by the present invention is to eliminate the above-mentioned problems.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention
The adapter ring on the inner circumferential side of the ring body is made of a non-self-tension metal thin plate having approximately the same width as the ring body, and its ends are overlapped with each other, and the coil of the coiled expander is A technical means is adopted to make the diameter of the ring approximately equal to the width of the ring body.

Effect The adoption of the above means allows for a small distance between the coiled expander and the side surface of the ring groove, and the meandering of the coiled expander within the ring groove is suppressed by the side surface of the ring groove, eliminating the meandering seen in the prior art. .

Furthermore, even if the diameter of the ring body increases due to wear on the outer peripheral surface of the ring body, and the diameter of the adapter ring also increases accordingly, both ends of the adapter ring still overlap, so there is no possibility that the two ends will face each other. No openings are formed, the coiled expander is not bitten into this part, and the coiled expander is not damaged.

EXAMPLE Reference is made to FIGS. 1 and 2. The combination seal ring 1 has a ring body 3 made of synthetic resin and has an outer circumferential surface that comes into sliding contact with the inner circumferential surface of the cylinder 2. The ring body 3 is preferably made of polytetrafluoroethylene (PTFE), and its width is slightly smaller than the dimension between the groove sides 7, 7' of the ring groove 4. The self-tensionless adapter ring 5 in contact with the inner peripheral surface of the ring body 3 is made of a thin metal plate,
The inner circumferential surface of one end overlaps the outer circumferential surface of the other end, as shown in FIG. 2, and its width is approximately the same as the width of the ring body 3. This adapter ring 5 is preferably made of stainless steel.

A coiled expander 6 is arranged on the inner peripheral side of the adapter ring 5. The coiled expander 6 is manufactured so that its diameter when installed is approximately the same as the width dimension of the ring body 3. As a result, either one of the ring groove side surfaces 7, 7' and the coiled expander 6
A small gap is created between them. The coiled expander 6 transmits the tension to the ring body 3 via the self-tensionless adapter ring 5, presses the sliding surface of the ring body 3 against the inner peripheral surface of the cylinder 2, and creates the necessary contact. Ensure airtightness under pressure. In order to increase the contact area between the adapter ring 5 and the coiled expander 6, a concave portion is formed in the adapter ring 5, and the coiled expander 6 is formed in this concave portion.
Alternatively, a flat surface may be formed on the side surface of the coiled expander 6 and this flat surface may be brought into contact with the adapter ring 5.

To prevent wear of the contact surfaces of the ring body 3, adapter ring 5, and coiled expander 6, or wear of the ring groove side surfaces 7, 7',
A known anti-wear treatment may be applied.

Effects According to the present invention, the contact pressure of the ring body to the inner circumferential surface of the cylinder is determined by the tension of the coiled expander, so it is easy to manage. or,
Since there is no meandering of the coiled expander, there is no adverse effect on other parts due to sudden seal leakage force.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an example of the present invention, and FIG. 2 is a perspective view of an adapter ring. In the figure, 3...Ring body, 4...Ring groove, 5
...Adapter ring, 6...Coil-shaped expander.

Claims (1)

[Scope of utility model registration request] a ring body made of synthetic resin; a thin metal adapter ring having almost the same width as the ring body and having almost no self-tension; and a ring body that is in contact with the inner peripheral surface of the adapter ring and when installed and a coil-shaped expander made of a coil having an outer diameter of approximately the same width as the adapter ring, and the inner circumferential surface of one end of the adapter ring overlaps the outer circumferential surface of the other end. Combination seal ring.