Gas sealing structure

Abstract

The utility model discloses a gas sealing structure which comprises a shell, a shaft sleeve, a rubber sealing ring and a sealing ring annular groove. The width of the long side wall in the sealing ring annular groove is larger than that of the short side wall, the width of the short side wall is larger than 1 / 3 of the width of the long side wall, the width of the short side wall is smaller than or equal to 2 / 3 of the width of the long side wall, and on the premise that the maximum filling rate of the rubber sealing ring is 90%, the diameter of the inner ring of the rubber sealing ring is kept unchanged; the section radius of the rubber sealing ring is properly increased, so that the rubber sealing ring can be filled in the area in the direction of the short side wall, the tolerance of the mounting groove, the outer diameter of the shaft sleeve, the bottom diameter of the sealing ring annular groove and the depth of the sealing ring annular groove can be effectively widened, the tolerance of a workpiece is + / -0.15 mm, and the machining cost is greatly reduced. After the shaft sleeve is pressed to a designated position in the pressing-in direction, the rubber sealing ring can effectively seal impact caused by gas, the improved groove scheme can effectively increase the contact area of the rubber sealing ring, and the gas leakage rate is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to seal ring installation field, concretely relates to a gas seal structure. BACKGROUND

[0002] The traditional seal gas O type ring (O-Ring) is the most common kind of seal ring, is suitable for static and dynamic seal, such as Figure 1 As shown in the figure, the width of the seal ring groove should be slightly larger than the diameter of the seal ring, to ensure that the seal ring can freely stretch and closely fit. But its tolerance requirement to workpiece matching piece is more strict, is basically in the range of ±0.1mm, and the processing requirement is higher, increases the processing cost. CONTENT OF THE UTILITY MODEL

[0003] The utility model is provided with a gas seal structure to solve the problems in the above background techniques.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] A gas seal structure, characterized by comprising:

[0006] The shell is internally provided with a mounting groove;

[0007] The shaft sleeve is pressed inside the mounting groove, and the shaft sleeve is provided with a seal ring ring groove for mounting the rubber seal ring, the long side wall is located on the side of the seal ring ring groove close to the pressing direction, the short side wall is located on the side of the seal ring ring groove away from the pressing direction, and the width of the long side wall is greater than the width of the short side wall.

[0008] Preferably, the width of the short side wall is greater than 1 / 3 of the width of the long side wall, and the width of the short side wall is less than or equal to 2 / 3 of the width of the long side wall.

[0009] Preferably, the seal ring ring groove is provided with a chamfer at the opening.

[0010] Compared with the prior art, the utility model has the beneficial effects that:

[0011] The width of the long side wall in the ring groove of the sealing ring in the application is greater than the width of the short side wall, and in the case that the width of the short side wall is greater than 1 / 3 of the width of the long side wall and the width of the short side wall is less than or equal to 2 / 3 of the width of the long side wall, under the premise that the maximum filling rate of the rubber sealing ring is 90%, the inner diameter of the rubber sealing ring is kept unchanged, and the cross-sectional radius is appropriately increased, so that the rubber sealing ring can be filled in the direction of the short side wall, the tolerances of the installation groove, the outer diameter of the shaft sleeve, the bottom diameter of the sealing ring groove and the depth of the sealing ring groove can be effectively relaxed, the workpiece tolerance is ±0.15mm, and the processing cost is greatly reduced. After the shaft sleeve is pressed into the specified position in the pressing direction, the rubber sealing ring can effectively seal the impact of the gas, and the improved groove scheme can effectively increase the contact area of the rubber sealing ring and reduce the gas leakage rate. The opening amount at the short side wall is increased, and the risk of thermal expansion and contraction of the rubber sealing ring caused by temperature is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 A schematic diagram for existing gas O-ring assembly;

[0013] Figure 2 A schematic diagram for rubber sealing ring assembly of the utility model;

[0014] Figure 3 A Figure 2 An enlarged schematic view of A in the middle;

[0015] In the figure: 1, housing; 2, shaft sleeve; 3, rubber sealing ring; 4, sealing ring groove. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0017] Please refer to Figures 1-3 The utility model provides a technical scheme: a gas sealing structure, characterized in that comprising:

[0018] A housing 1, an installation groove is formed in the housing 1;

[0019] A shaft sleeve 2, the shaft sleeve 2 is pressed inside the installation groove, a sealing ring groove 4 for installing a rubber sealing ring 3 is formed in the shaft sleeve 2, one side of the sealing ring groove 4 close to the pressing direction is a long side wall a, the other side of the sealing ring groove 4 away from the pressing direction is a short side wall b, and the width of the long side wall a is greater than the width of the short side wall b.

[0020] In the embodiment, the width of the short side wall b is greater than 1 / 3 of the width of the long side wall a, and the width of the short side wall b is less than or equal to 2 / 3 of the width of the long side wall a.

[0021] In the embodiment, a chamfer is arranged at the opening of the sealing ring groove 4, which is generally 15° to 30°, and the width of the chamfer is about 0.2 times the diameter of the sealing ring, so as to facilitate installation and protect the rubber sealing ring. Arranging the chamfer at the opening of the sealing ring groove 4 facilitates the installation of the sealing ring groove 4 and prevents damage during installation.

[0022] In the sealing ring groove 4 in the application, the width of the long side wall a is greater than the width of the short side wall b, and in the case where the width of the short side wall b is greater than 1 / 3 of the width of the long side wall a and the width of the short side wall b is less than or equal to 2 / 3 of the width of the long side wall a, the inner diameter of the rubber sealing ring 3 is kept unchanged, and the cross-sectional radius is appropriately increased under the premise that the maximum filling rate of the rubber sealing ring 3 is 90%, so that the rubber sealing ring 3 can be filled in the direction of the short side wall b, the tolerances of the installation groove, the outer diameter of the shaft sleeve, the bottom diameter of the sealing ring groove 4, and the depth of the sealing ring groove 4 can be effectively relaxed, so that the workpiece tolerance is ±0.15mm, and the processing cost is greatly reduced. After the shaft sleeve 2 is pressed in the direction to the specified position, the rubber sealing ring 3 can effectively seal the impact of the gas, and the improved groove scheme can effectively increase the contact area of the rubber sealing ring 3 and reduce the gas leakage rate. The application can reduce the risk of thermal expansion and contraction of the rubber sealing ring caused by temperature by increasing the opening amount at the short side wall b.

[0023] Although the embodiments of the application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. A gas seal structure, characterized by, The utility model relates to a rubber sealing ring installation structure of a valve cover, which comprises the following: A housing (1) with an installation groove inside; A shaft sleeve (2) pressed inside the installation groove, a sealing ring ring groove (4) for installing a rubber sealing ring (3) is opened on the shaft sleeve (2), the side close to the pressing direction of the sealing ring ring groove (4) is a long side wall (a), the side far from the pressing direction of the sealing ring ring groove (4) is a short side wall (b), the width of the long side wall (a) is greater than the width of the short side wall (b).

2. A gas seal according to claim 1, wherein: The width of the short side wall (b) is greater than 1 / 3 of the width of the long side wall (a), and the width of the short side wall (b) is less than or equal to 2 / 3 of the width of the long side wall (a).

3. A gas seal according to claim 1, wherein: A chamfer is arranged at the opening of the sealing ring ring groove (4).

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