CN201425050Y

CN201425050Y - Combined sealed screw

Info

Publication number: CN201425050Y
Application number: CN200920044807XU
Authority: CN
Inventors: 许钧智
Original assignee: SHUYUAN MACHINERY ENTERPRISE (KUNSHAN) CO Ltd
Current assignee: SHUYUAN MACHINERY ENTERPRISE (KUNSHAN) CO Ltd
Priority date: 2009-05-19
Filing date: 2009-05-19
Publication date: 2010-03-17
Anticipated expiration: 2019-05-19

Abstract

The utility model relates to a combined sealed screw, which consists of a screw and a sealing ring. The upper edge of the bottom surface of a screw cap is provided with a groove along the circumferential direction. The sealing ring is embedded in the groove. The section diameter of the sealing ring is more than the depth of the groove. The utility model not only has the fixing and dustproof performance but also has the specific sealing performance of the sealing ring. The utility model solves the problems of bad sealing performance, which can cause the waste of work medium and the environmental pollution easily, and short service life for the prior screw.

Description

The composite seal screw

Technical field

The utility model relates to screw fastener, relates in particular to a kind of composite seal screw, and this composite seal screw is specially adapted to the fixing seal of various hydraulic equipments and casing.

Background technique

The drainage of working medium in various hydraulic equipments and the casing for convenience is equipped with the screw mouth of draining medium in the bottom surface or the side of various hydraulic equipments and casing, and with the sealing that is fixed of supporting screw.

Be usually used in the bottom surface of various hydraulic equipments of fixing seal and casing or the screw 3 that the side is equipped with the screw mouth of draining medium, also can be described as bolt, as shown in Figure 1, form by nut 1 and screw rod 2; This screw can only play fixing and dust-tight effect, and its sealing effect is relatively poor.As long as compression shock appears in hydraulic equipment and box house, then its internal work medium will leak outside, and causes the waste of working medium and the pollution of environment.Leak outside for fear of working medium, after screw was screwed into above-mentioned screw mouth, people tightened a circle after often screw being screwed to rating value again, to reduce the gap of its surface of contact, so not only can shorten the working life of screw, but also can may wear to the screw thread of hydraulic equipment or screw mouth end, casing cooperation place.Therefore, need running check and replacing, directly have influence on the continuity of operation, and increased employee's workload.

Therefore, the utility model provides a kind of composite seal screw, to remedy the deficiencies in the prior art from improving the prior art angle.

Summary of the invention

The utility model provides a kind of composite seal screw, and its purpose mainly is to solve existing screw poor sealing performance, causes the waste of working medium and the pollution of environment easily, and the problem of lacking working life.

For achieving the above object, the technical solution adopted in the utility model is: a kind of composite seal screw, to form by screw and seal ring, and a groove is circumferentially offered in the bottom surface upper edge of the nut of described screw; Described seal ring is embedded in this groove, and the cross section diameter of described seal ring is greater than the degree of depth of described groove.

Related content in the technique scheme is explained as follows:

1, in the such scheme, the cross section diameter of described seal ring is greater than the degree of depth of described groove, and in the time of promptly in seal ring is embedded at this groove, some spills groove.

2, in the such scheme, the cross section diameter of described seal ring is less than the groove width of groove, make when seal ring is embedded in this groove, be nature, when this composite seal screw is installed and used, seal ring is in compressive state, the space in the groove be used to hold the seal ring pressurized after amount of deformation, thereby reach sealing effect.

3, in the such scheme, described seal ring is a rubber seal, this rubber seal high resilience, and have suitable mechanical strength (comprising tensile breaking strength, elongation percentage and tearing toughness etc.), its stable performance is difficult for swelling in medium, thermal pinch (joule heating effect) is little, easily shape, and can keep accurate size, do not corrode surface of contact, not pollution medium.

Because the technique scheme utilization, the utility model compared with prior art has following advantage:

1, because the utility model employing is offered a groove at the bottom surface of the nut of bolt, and in this groove, be embedded a seal ring, make screw under not varying sized situation, not only have fixing and dust-tight effect, also possessed the sealability that seal ring had simultaneously.In this screw screws in the screw mouth of hydraulic equipment or casing cooperation place and when oppressing described seal ring, because seal ring pressurized, make between this composite seal screw and hydraulic equipment or the casing cooperation place closely seamless, thereby have good sealing effect, avoided the pollution of the leaking outside of working medium, waste and environment.

2, because the utility model employing is offered a groove at the bottom surface of the nut of bolt, and in this groove, be embedded a seal ring, prolonged the working life of this composite seal screw, and enlarged its using scope.

Description of drawings

Accompanying drawing 1 is existing screw structural schematic representation;

Accompanying drawing 2 is the utility model structural representation;

Accompanying drawing 3 is the utility model assembling schematic representation.

In the above accompanying drawing: 1, nut; 2, screw rod; 3, screw; 4, seal ring; 5, groove; 6, screw mouth.

Embodiment

Below in conjunction with drawings and Examples the utility model is further described:

Embodiment:

As shown in Figure 2, a kind of composite seal screw is made up of screw 3 and seal ring 4, and a groove 5 is circumferentially offered in the bottom surface upper edge of screw 3 nuts 1; Seal ring 4 is embedded in this groove 5.The cross section diameter of seal ring 4 is greater than the degree of depth of groove 5, and in the time of promptly in seal ring 4 is embedded at this groove 5, some spills groove 5.The cross section diameter of seal ring 4 is less than the groove width of groove 5, make when seal ring 4 is embedded in this groove 5, be nature, when this composite seal screw is installed and used, seal ring 4 is in compressive state, spaces in the groove 5 be used to hold seal ring 4 pressurizeds after amount of deformation, thereby reach sealing effect.

As shown in Figure 3, when this composite seal screw is anchored on screw mouth 6 places of hydraulic equipment or casing cooperation place, be to locate by nut 1 bottom plane of screw 3 (not shown)s, the process of thread is the process of compresses seal 4 just, because seal ring 4 pressurizeds, make between the bottom plane of this composite seal screw nut 1 and hydraulic equipment or the casing fitting surface closely seamless, thereby have good sealing effect, avoided the pollution of the leaking outside of working medium, waste and environment.As long as this composite seal screw is tightened, need not to add again and twist a circle, both prolonged the working life of this composite seal screw, also prolong the working life of hydraulic equipment and casing, but also enlarged the using scope of this composite seal screw.Solve because of it leaks direct sealing characteristics by seal ring 4 by the caused working medium in unavoidable two interplanar gaps, thereby make this composite seal screw not only have fixing and anti-dust performance, also possessed seal ring 4 peculiar sealabilities.

The foregoing description only is explanation technical conceive of the present utility model and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present utility model and enforcement according to this, can not limit protection domain of the present utility model with this.All equivalences of being done according to the utility model spirit change or modify, and all should be encompassed within the protection domain of the present utility model.

Claims

1, a kind of composite seal screw is characterized in that: be made up of screw (3) and seal ring (4), a groove (5) is circumferentially offered in the bottom surface upper edge of the nut (1) of described screw (3); Described seal ring (4) is embedded in this groove (5), and the cross section diameter of described seal ring (4) is greater than the degree of depth of described groove (5).

2, composite seal screw according to claim 1 is characterized in that: the cross section diameter of described seal ring (4) is less than the groove width of groove (5).