CN2876501Y

CN2876501Y - Plastic expansion joint

Info

Publication number: CN2876501Y
Application number: CN 200620000929
Authority: CN
Inventors: 赵长生; 干方明
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-01-13
Filing date: 2006-01-13
Publication date: 2007-03-07
Anticipated expiration: 2016-01-13

Abstract

The utility model belongs to the field of pipe connection, specifically relates to a plastic expansion bend. The plastic expansion bend is disposed with an inner sleeve, several circular grooves used for disposing the O-shaped seal ring arranged on the external wall of the inner sleeve and an external sleeve fit over the inner sleeve, the section of the O-shaped seal ring is circular; the section of the circular groove is a trapezium with the bottom angle of round angle, the notch width of the circular groove is larger than that of the bottom. The circular groove of the utility model with reliable tightness could be matched with the O-shaped seal ring preferably and retractile.

Description

Plastic telescopic section

Technical field

The utility model relates to the pipeline connection technology field, particularly plastic pipe interconnection technique field.

Background technique

Plastic pipe is along with its many advantage at aspect of performance, it is ageing-resistant, the pipeline that can avoid itself in corrosion protection and the conveying with pollution or the like the characteristic of dissolved ions, make plastic pipe produce and life in to be used as the application percentage of delivery line of long distance more and more higher.

Plastic pipe is when being used as the delivery line of long distance, need couple together by slip joint a lot of independent pipelines are sectional, but, plastic pipe make the plastic conveying and plastic pipeline of long distance cause its length change bigger because of the temperature difference that the conversion in season produces owing to having bigger thermal expansion coefficient, so be used to connect the quality of the slip joint of independent pipeline and pipeline, becoming influences the key factor of plastic pipe as the usability of the delivery line of long distance.

The slip joint that is used for connecting tube and pipeline, normally used is metal slip joint, under certain temperature difference environment, can guarantee effective operation of whole delivery pipeline system, but metal slip joint can reduce ageing-resistant, the corrosion protection of integral body of plastic pipe and the pipeline that can avoid itself in the conveying with pollution or the like the characteristic of dissolved ions; In addition, because the thermal expansion coefficient of metal material and the thermal expansion coefficient of plastic material differ bigger, so, seepage or leakage take place easily in the joint of stainless steel telescopic joint and plastic pipe.

So, more and more connect plastic pipe now and use plastic telescopic section to connect.Generally speaking sealing in the plastic telescopic section between inner sleeve and the outer sleeve, is the socket place at inner sleeve and outer sleeve, open loop shape groove, and the O RunddichtringO is set in ditch, to reach the effect of sealing.

The claimant finds in practice, plastic telescopic section on the present market, the disclosed slip joint that is used for automobile engine exhaust pipe of Chinese patent literature CN2436657Y for example, the disclosed slip joint that is used for discharge pipe line of Chinese patent literature CN2474883Y etc., the cross section of its O-ring seals be shaped as circle, the cross section of its annular groove be shaped as rectangle, when this kind plastic telescopic section in use, O-ring seals is out of shape because of the extruding that is subjected to outer sleeve, at annular groove bottom land place, it is consistent with the annular groove cross section that the sectional shape of O-ring seals will tend to, so the force direction that is subjected at bottom land place seal ring is mixed and disorderly, can not concentrate and point to the notch direction, the resilience effect of the O-ring seals after causing being squeezed descends, and then influences sealing effect; While is owing to the extruding that seal ring is subjected to outer sleeve in use deforms, substantially fill up the space of bottom land, the distortion of seal ring part at place, two right angles that is positioned at bottom land like this is bigger, tend to exceed the deformability that it can bear, permanent deformation takes place, the internal structure that is to say the seal ring of this part is damaged, so will influence the usability of O-ring seals to a certain extent.

The model utility content

The purpose of this utility model provides the plastic telescopic section that a kind of annular groove and O-ring seals can better cooperate.

Another purpose of the present utility model provides a kind of capable of expansion and contraction, the reliable plastic telescopic section of sealability.

The technological scheme that realizes the utility model purpose is: a kind of plastic telescopic section, have inner sleeve, be located on the inner sleeve outer wall several and be used to that the annular groove of O-ring seals is set and be enclosed within outer sleeve on the described inner sleeve, the cross section of described O-ring seals be shaped as circle; The sectional shape of described annular groove is that the base angle is trapezoidal that fillet is arranged, and the width of rebate of wherein said annular groove is greater than the bottom land width.

The angle that the inwall of described annular groove is become with described bottom land, is preferably less than 100 degree greater than 90 degree greater than 90 degree less than 110 degree; The radius of a circle of the inwall of described connection annular groove and the fillet of described bottom land is 1: 4～15 with the ratio of the diameter of section of O-ring seals, be preferably 1: 6.5～and 9.

The elongation percentage of described O-ring seals is 1～7%, is preferably 1～5%; The compressibility of described O-ring seals is 10～30%, is preferably 12～22%; The degree of depth of described annular groove is 0.6～0.9: 1 with the ratio of the diameter of section of O-ring seals, is preferably 0.7～0.9: 1; The bottom land width and the O-ring seals diameter ratio of described annular groove are 1.05～1.2: 1, are preferably 1.1～1.2: 1; The minimum separable of described inner sleeve and described outer sleeve and O-ring seals diameter ratio are 0.05～0.5: 1, are preferably 0.2～0.3: 1.

The socket end of described inner sleeve is provided with annular groove, and the connecting end of described inner sleeve is provided with connecting head; The connecting end of described outer sleeve also is provided with connecting head.

The socket end that is enclosed within on the described inner sleeve of described outer sleeve is provided with screw thread, also is with the flange that can be threaded with the socket end of described outer sleeve on the described inner sleeve.

Part on the described inner sleeve between described seal section and described connecting head is called intermediate section, the external diameter of pipe of described intermediate section is less than the external diameter of pipe of described seal section, also be with a guide ring on the described intermediate section with breaking joint, described guide ring is between described outer sleeve and described flange, and the internal diameter of described guide ring is less than the external diameter of pipe of described seal section.

Described connecting head is flange-type connecting head or tube-inserted type connecting head.

Between the inner sleeve outer wall at the inwall of described annular groove and described notch place a fillet is arranged, this radius of a circle of fillet that connects the inner sleeve outer wall at the inwall of described annular groove and described notch place is 0.1mm～0.3mm.

The utlity model has positive effect: (1) the utility model improves the shape of the annular groove that is used to be provided with O-ring seals, making its sectional shape into present base angle from traditional rectangle is trapezoidal that fillet is arranged, because plastic telescopic section in use, sectional shape fills up annular groove for the seal ring of circle can be compressed distortion, when the annular groove sectional shape is rectangle, seal ring is bigger in the distortion meeting at bottom land place, and the degree of this kind distortion can influence the usability of seal ring; And the utility model is modified into fillet by the base angle with the bottom land both sides just, make annular groove of the present utility model with the sectional shape that uses adapt as the seal ring of circle, reduce and adjusted the distortion of seal ring, make the degree of this kind distortion can not be increased to the degree of the usability that influences seal ring at the bottom land place; Simultaneously because the annular groove in the utility model is that the base angle is the groove that fillet is arranged, according to force analysis, the force direction that is subjected to of its bottom land place seal ring mainly is to point to notch, the directivity of the spring-back force of seal ring integral body is comparatively concentrated and is mainly pointed to notch like this, so the utility model also has rebound elasticity advantage preferably.(2) when the utility model employing resin especially ABS resin manufacturing, if adopt the disclosed above-mentioned data of the utility model to design and make, prepared the utility model is capable of expansion and contraction, and the performance of aspects such as sealability is more superior.

Description of drawings

For the easier quilt of content of the present utility model is clearly understood, according to specific embodiment of the utility model also in conjunction with the accompanying drawings, the utility model is described in further detail, wherein below

Fig. 1 is the structural representation of section of the present utility model.

Fig. 2 is the partial enlarged view at A place in the plastic telescopic section shown in Figure 1.

Fig. 3 is the structural representation of guide ring in the plastic telescopic section shown in Figure 1.

Fig. 4 is that the B of Fig. 3 is to view.

Fig. 5 is the another kind of architecture schematic representation of section of the present utility model.

Reference character is expressed as among the figure: inner sleeve 1, socket end 11, connecting end 12, seal section 13, intermediate section 14, O-ring seals 2, annular groove 3, notch 31, bottom land 32, inwall 33, outer sleeve 4, socket end 41, connecting end 42, connecting head 5, flange 6, guide ring 7, breaking joint 8.

Embodiment

(embodiment 1)

See Fig. 1 to Fig. 4, the plastic telescopic section material therefor of present embodiment is third rare nitrile-butadiene-styrol copolymer (being commonly called as ABS resin), have inner sleeve 1, be located on inner sleeve 1 outer wall three and be used to that the annular groove 3 of O-ring seals 2 is set and be enclosed within outer sleeve 4 on the described inner sleeve 1, the cross section of described O-ring seals 2 be shaped as circle;

Part on the described inner sleeve 1 between described seal section 13 and described connecting head 4 is called intermediate section 14, the external diameter of pipe of described intermediate section 14 is less than the external diameter of pipe of described seal section 13, also be with a guide ring 7 on the described intermediate section 14 with breaking joint 8, described guide ring 7 is between described outer sleeve 4 and described flange 6, and the internal diameter of described guide ring 7 is less than the external diameter of pipe of described seal section 13; The external diameter of pipe d of described seal section 13 is 395.3mm;

The socket end 41 that is enclosed within on the described inner sleeve 1 of described outer sleeve 4 is provided with screw thread, also is with the flange 6 that can be threaded with the socket end 41 of described outer sleeve 4 on the described inner sleeve 1;

The sectional shape of described annular groove 3 is that the base angle is trapezoidal that fillet is arranged, and notch 31 width of wherein said annular groove 3 are greater than bottom land 32 width;

The socket end 11 of described inner sleeve 1 is provided with annular groove 3, and the connecting end 12 of described inner sleeve 1 is provided with connecting head 5; The connecting end 42 of described outer sleeve 4 also is provided with connecting head 5; Connecting head 5 in the present embodiment is the flange-type connecting head.

Between inner sleeve 1 outer wall at the inwall 33 of described annular groove 3 and described notch 31 places a fillet is arranged, this radius of a circle r of fillet that connects inner sleeve 1 outer wall at the inwall 33 of described annular groove 3 and described notch 31 places is 0.2mm.

The cross section diameter of a circle of described O-ring seals 2 is 8.6mm, and elongation percentage is 2%, and described O-ring seals 2 realistic compression ratio in use is 19.4%;

The angle that the inwall 33 of described annular groove 3 is become with described bottom land 32 is 94 degree; The radius of a circle R of the inwall 33 of described connection annular groove 3 and the fillet of described bottom land 32 is 1mm.

The degree of depth h of described annular groove 3 is 6.88mm; The bottom land 32 width a of described annular groove 3 are 9.46mm; The minimum separable of described inner sleeve 1 and described outer sleeve 4 also is that the spacing between the pipe outer wall of seal section 13 of the inwall 33 of described inner sleeve 1 and described outer sleeve 4 is 0.5mm.

Annular groove in the present embodiment goes out with the lathe car.

(embodiment 2)

See Fig. 5, the plastic telescopic section and the embodiment of present embodiment are basic identical, and difference is: the used connecting head 5 of present embodiment is the tube-inserted type connecting head, during use, external plastic pipe can be filled in the cavity of described tube-inserted type connecting head 5, be got final product with glue is bonding again.

(embodiment 3)

All the other are substantially the same manner as Example 1, and difference is: the cross section diameter of a circle of O-ring seals described in the present embodiment 2 is 2.8mm; The angle that the inwall of described annular groove is become with described bottom land is 109 degree; The radius of a circle of the inwall of described connection annular groove and the fillet of described bottom land is 1: 15 with the ratio of the diameter of section of O-ring seals; The elongation percentage of described O-ring seals is 1%, and the compressibility of described O-ring seals is 10%; The degree of depth of described annular groove is 0.6: 1 with the ratio of the diameter of section of O-ring seals; The bottom land width of described annular groove and O-ring seals diameter ratio are 1.05: 1; The minimum separable of described inner sleeve and described outer sleeve and O-ring seals diameter ratio are 0.05: 1.

(embodiment 4)

All the other are substantially the same manner as Example 1, and difference is: the cross section diameter of a circle of O-ring seals described in the present embodiment 2 is 4mm; The angle that the inwall of described annular groove is become with described bottom land is 100 degree; The radius of a circle of the inwall of described connection annular groove and the fillet of described bottom land is 1: 9.1 with the ratio of the diameter of section of O-ring seals; The elongation percentage of described O-ring seals is 3%, and the compressibility of described O-ring seals is 20%; The degree of depth of described annular groove is 0.7: 1 with the ratio of the diameter of section of O-ring seals; The bottom land width of described annular groove and O-ring seals diameter ratio are 1.1: 1; The minimum separable of described inner sleeve and described outer sleeve and O-ring seals diameter ratio are 0.2: 1.

(embodiment 5)

All the other are substantially the same manner as Example 1, and difference is: the cross section diameter of a circle of O-ring seals described in the present embodiment 2 is 4mm; The angle that the inwall of described annular groove is become with described bottom land is 95 degree; The radius of a circle of the inwall of described connection annular groove and the fillet of described bottom land is 1: 6.5 with the ratio of the diameter of section of O-ring seals; The elongation percentage of described O-ring seals is 2%, and the compressibility of described O-ring seals is 22%; The degree of depth of described annular groove is 0.8: 1 with the ratio of the diameter of section of O-ring seals; The bottom land width of described annular groove and O-ring seals diameter ratio are 1.2: 1; The minimum separable of described inner sleeve and described outer sleeve and O-ring seals diameter ratio are 0.3: 1.

(embodiment 6)

All the other are substantially the same manner as Example 1, and difference is: the cross section diameter of a circle of O-ring seals described in the present embodiment 2 is 6mm; The angle that the inwall of described annular groove is become with described bottom land is 91 degree; The radius of a circle of the inwall of described connection annular groove and the fillet of described bottom land is 1: 4 with the ratio of the diameter of section of O-ring seals; The elongation percentage of described O-ring seals is 5%, and the compressibility of described O-ring seals is 30%; The degree of depth of described annular groove is 0.9: 1 with the ratio of the diameter of section of O-ring seals; The bottom land width of described annular groove and O-ring seals diameter ratio are 1.2: 1; The minimum separable of described inner sleeve and described outer sleeve and O-ring seals diameter ratio are 0.5: 1.

According to the above-mentioned embodiment, the person of an ordinary skill in the technical field can reasonably select in the number range that the utility model limited according to concrete designing requirement.

Obviously, the foregoing description of the present utility model only is for the utility model example clearly is described, and is not to be qualification to mode of execution of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all mode of executions.And these belong to conspicuous variation or the change that spirit of the present utility model extended out and still are among the protection domain of the present utility model.

Claims

1, a kind of plastic telescopic section, have inner sleeve (1), be located on inner sleeve (1) outer wall several and be used to be provided with the annular groove (3) of O-ring seals (2) and be enclosed within outer sleeve (4) on the described inner sleeve (1), the cross section of described O-ring seals (2) be shaped as circle; It is characterized in that: the sectional shape of described annular groove (3) is that the base angle is trapezoidal that fillet is arranged, and notch (31) width of wherein said annular groove (3) is greater than bottom land (32) width.

2, plastic telescopic section according to claim 1 is characterized in that: the angle that the inwall (33) of described annular groove (3) is become with described bottom land (32) is spent greater than 90 less than 110 degree; The ratio of the radius of a circle of the inwall (33) of described connection annular groove (3) and the fillet of described bottom land (32) and the diameter of section of O-ring seals (2) is 1: 4～15.

3, plastic telescopic section according to claim 2 is characterized in that: the angle that the inwall (33) of described annular groove (3) is become with described bottom land (32) is spent greater than 90 less than 100 degree; The ratio of the diameter of a circle of the inwall (33) of described connection annular groove (3) and the fillet of described bottom land (32) and the diameter of section of O-ring seals (2) is 1: 6.5～9.

4, plastic telescopic section according to claim 1 is characterized in that: the elongation percentage of described O-ring seals (2) is 1～7%, and the compressibility of described O-ring seals (2) is 10～30%; The ratio of the diameter of section of the degree of depth of described annular groove (3) and O-ring seals (2) is 0.6～0.9: 1; Bottom land (32) width of described annular groove (3) and O-ring seals (2) diameter ratio are 1.05～1.2: 1; Described inner sleeve (1) is 0.1～0.5: 1 with the minimum separable and O-ring seals (2) diameter ratio of described outer sleeve (4).

5, plastic telescopic section according to claim 4 is characterized in that: the elongation percentage of described O-ring seals (2) is 1～5%, and the compressibility of described O-ring seals (2) is 12～22%; The ratio of the diameter of section of the degree of depth of described annular groove (3) and O-ring seals (2) is 0.7～0.9: 1; Bottom land (32) width of described annular groove (3) and O-ring seals (2) diameter ratio are 1.1～1.2: 1; Described inner sleeve (1) is 0.2～0.3: 1 with the minimum separable and O-ring seals (2) diameter ratio of described outer sleeve (4).

6, plastic telescopic section according to claim 1 is characterized in that: the socket end (11) of described inner sleeve (1) is provided with annular groove (3), and the connecting end (12) of described inner sleeve (1) is provided with connecting head (5); The connecting end (42) of described outer sleeve (4) also is provided with connecting head (5).

7, plastic telescopic section according to claim 6, it is characterized in that: the socket end (41) that is enclosed within on the described inner sleeve (1) of described outer sleeve (4) is provided with screw thread, also is with the flange (6) that can be threaded with the socket end (41) of described outer sleeve (4) on the described inner sleeve (1).

8, plastic telescopic section according to claim 7, it is characterized in that: the part that is positioned on the described inner sleeve (1) between described seal section (13) and the described connecting head (4) is called intermediate section (14), the external diameter of pipe of described intermediate section (14) is less than the external diameter of pipe of described seal section (13), also be with a guide ring (7) on the described intermediate section (14) with breaking joint (8), described guide ring (7) is positioned between described outer sleeve (4) and the described flange (6), and the internal diameter of described guide ring (7) is less than the external diameter of pipe of described seal section (13).

9, plastic telescopic section according to claim 6 is characterized in that: described connecting head (5) is flange-type connecting head or tube-inserted type connecting head.

10, plastic telescopic section according to claim 1, it is characterized in that: between inner sleeve (1) outer wall that the inwall (33) of described annular groove (3) and described notch (31) are located a fillet is arranged, this radius of a circle that connects the fillet of the inwall (33) of described annular groove (3) and inner sleeve (1) outer wall that described notch (31) is located is 0.1mm～0.3mm.