JP3361961B2 - Connector sealing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for a connector of an oil pipe. More specifically, the present invention relates to a connector sealing device for an oil pipe having both low temperature properties and oil resistance.

[0002]

2. Description of the Related Art The prior art relating to the connector sealing device of the present invention includes a connector sealing device shown in FIG.

FIG. 6 is a sectional view of a connector sealing device for a pipe for feeding fuel oil.

In FIG. 6, reference numeral 50 is a sealing device. The sealing device 50 is provided to seal the joint portion 71 of the two pipes 70, 70 for feeding the fuel oil. The sealing device 50 is provided with a joint portion 51 having threaded portions 51a at both ends, and both end portions of the joint portion 51 are pipe end portions 70a, 70a of two pipes 70, 70.
Is fitted to.

An O-ring 52 made of a fluororubber material is fitted between the joint portion 51 and each of the pipe ends 70a, 70a to seal the two. This O-ring 5
2 is arranged in an O-ring mounting groove 54 formed between the step portion 51b provided at the end of the joint portion 51 and the spacer 53.

The spacer 53 is held on the joint portion 51 by a fastener 55 which is screwed with the screw portion 51a . Further , the fastening tool 55 is configured such that the pipe end portions 70a, 7a, 7b are provided via the bite ring 56 provided with the engaging portion 56a that is bite into the pipe end portion 70a.
It is bound to 0a. Then, the fastener 55 is the joint portion 51.
The spacer 53 is held by being screwed to the joint portion 5
It is linked to 1. In addition, the fastener 55 coupled to the joint portion 51 has the pipe end portions 70 a, 70 a via the bite ring 56.
Are respectively combined with.

In the fuel oil connector sealing device 50 of the prior art constructed as described above, when the fuel oil flows in the pipes 70, 70, the pipe ends 70a, 70a of the two pipes are formed.
The O-ring 52 seals out the fuel oil flowing out from the gap.

[0008]

However, since the O-ring 52 is made of a fluororubber material, even if the fuel oil contacts the O-ring 52, the O-ring 52 does not swell and the characteristics are not significantly deteriorated. On the other hand, there is a drawback that the sealing ability is small. In addition to this, the cost of fluororubber is also a problem because of its high cost.

In particular, when used in a car or the like used in cold regions, this O-ring 52 made of fluororubber material is used.
Since the elasticity decreases as the temperature decreases, fuel oil may leak and cause a problem.

The present invention has been made in view of the above problems, and a technical problem thereof is to obtain a sealing device which is excellent in oil resistance and cold resistance.

Another object of the present invention is to obtain a sealing device which has a function excellent in oil resistance in a portion in contact with fuel oil and a function excellent in cold resistance in a portion in contact with low temperature.

Still another object of the present invention is to obtain a connector sealing device which exhibits oil resistance and cold resistance against fuel oil and also exhibits sealing ability.

[0013]

The present invention has been made to solve the above-mentioned technical problems, and the technical means is configured as follows. That is,

[0014] The connector sealing device according to the present invention, there is provided a sealing device for a connector for sealing the interval fitting of the joint portion connecting the connecting portion of the pipe having an oil passage therein, connections and the said pipe a joint portion for connecting the mating connection part communicating with the oil passage of the connecting portion, the connecting portion of the joint portion and mating
Fitting the seal portion ring-shaped in between fitting between the connecting part comprises an annular attachment groove, wherein from the oil passage of the mounting groove oil made of nitrile rubber material on the side outflow annular first with arranging the sealing portion, Tokoro the atmosphere side of the first seal portion
An annular second seal portion made of a rubber material, which is more excellent in cold resistance than the first seal portion, is arranged at regular intervals .

[0015] Preferably, the seal ring made of a resin material is disposed between the first seal portion and the second sealing portion.

[0016] Further, the a in the structure be arranged in the side oil from the oil passage with the first seal portion and a second seal portion are integrated through the support ring flows out to the first seal portion
May be .

Still further, in the connector sealing device according to the present invention, the mounting groove includes an annular first mounting groove and a second mounting groove, and the first mounting groove is formed of an oil. together with the oil from the road to place the first seal part is an O-ring made of nitrile rubber material on the side of the outflow during a predetermined on the atmosphere side from the first seal portion
A second seal part, which is an O-ring made of a rubber material and is more excellent in cold resistance than the first seal part, is arranged at a distance, and the second seal part is provided.
The third seal portion is arranged in the mounting groove of the third seal portion. The third seal portion is made of a nitrile rubber material in approximately half of the cross-section where the oil flows out from the oil passage, and the other half is in the first half. Even if it is made of a rubber material that is more resistant to cold than the seal part of
Good .

[0018]

[Action] piping connection portions same or piping and equipment and the connection portion between <br/> joint portion connecting the fitting interval to a first hydrogenated nitrile rubber made to the side in contact with the passage of the pipe with arranging the seal portion, since the second sealing portion made hydrin material on the atmosphere side is coordinated <br/> location, even if the oil of the distribution tube has leaked in between fitting of the joint portion first It will be sealed without being thus swelled the seal portion.

Further, even if the atmosphere side between the fittings is cooled in a cold region, the sealing performance of the second seal portion does not deteriorate, so that water and the like on the atmosphere side can be prevented from entering and the first seal portion can be prevented. It also has an effect of preventing the sealing performance from being deteriorated due to cooling of the sealing part .

[0020] Particularly, since Shirurin grayed between <br/> the first seal portion and the second sealing portion is arranged, a first seal portion and the second seal portion exhibits a sealing capability while supporting so as to, in Shirurin grayed themselves, forming a function of sealing the fluid flowing from both sides in cooperation with the sealing portion.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION A connector sealing device showing an embodiment according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a half sectional view showing an embodiment according to the present invention.

In FIG. 1, 1A is a sealing device. The sealing device 1A includes a joint portion 2 having a first mounting groove 3a,
It is composed of a first seal portion 4 and a second seal portion 5 mounted in the first mounting groove 3a.

The joint portion 2 has an inner peripheral surface 6 which is fitted with the pipe 20.
The first mounting groove 3a is provided in the. Further, a second mounting groove 3b is formed on the outer peripheral surface 7 that is fitted with the pipe 21a of the device 21 that communicates with the oil passage 13 of the pipe 20, and at the same time, the first mounting groove 3 has three lines. Formed caulking groove 9
Is provided. The pipe 21a and the joint portion 2 may be hermetically joined by welding.

The joint portion 2 is formed by forming the inner peripheral surface 6 of the inner peripheral surface 6 on the device 21 side on the inner peripheral surface 6 having a small diameter.
The step surface 10 is formed with a surface that comes into contact with the end surface 20b of 0a. The joint portion 2 is manufactured by machining metal as required, or by molding a cast product or a resin material.

[0026] The inner peripheral surface 6 of the joint portion second end surface 20 b fitted piping 20 is held in position abutting the step surface 10. A first seal portion 4 which is an O-ring made of nitrile rubber, particularly hydrogenated nitrile rubber material, is arranged on the step surface 10 side of the first mounting groove 3. A second seal portion 5 which is an O-ring made of a rubber material, for example, a hydrin rubber material, which is more excellent in cold resistance than the first seal portion 4, is arranged on the atmosphere side next to the seal portion 5. A seal ring 11 made of a synthetic resin and having a square cross section is arranged between the first seal portion 4 and the second seal portion 5.

A first seal portion 4 which is an O-ring made of a hydrogenated nitrile rubber material is arranged in the second mounting groove 3b of the joint portion 2. The second seal portion 5 can be attached to the second attachment groove 3b if necessary. The reason is that the oil side of the second mounting groove 3b is caulked tightly, and therefore the amount of oil that directly contacts the second seal portion 5 is small. The second seal portion 5 also has some oil resistance and therefore does not easily swell.

The sealing device 1A shown in FIG. 1 seals a fitting portion of a connector at a connection portion of a fuel pipe for an automobile with a device 21. Since vehicle is used even at the cold region, a portion in contact with the atmosphere of the pipe 2 0 -4
It may be below 0 ° C. However, since the second seal portion 5 made of fluorosilicone rubber or hydrin rubber is arranged on the atmosphere side of the first mounting groove 3a of the sealing device 1A, the sealing ability of the sealing device is reduced against low temperature. It can be expected to effectively prevent this.

In particular, the seal portions 4 and 5 made of hydrogenated nitrile rubber or hydrin rubber are made of conventional fluorine rubber O.
Since the price is lower than that of rings, it is extremely useful for mass-produced products.

Further, since the first seal portion 4 made of a hydrogenated nitrile rubber material is provided on the side in contact with the fuel oil, it may be swollen by the fuel oil to reduce the tensile strength and the elongation. Since it does not exist, it exhibits sealing ability against fuel oil.

FIG. 2 is a half sectional view of a sealing device 1B showing a second embodiment according to the present invention.

In FIG. 2, the third seal portion 12 disposed in the second mounting groove 3b has a left ring 12a having a semicircular cross section made of hydrogenated nitrile rubber on the fuel oil side and an atmosphere side. The right ring 12b, which is made of a hydrin rubber material and has a semicircular cross section, is integrated by baking or bonding.

The other structure is almost the same as that of the sealing device shown in FIG.

The third seal portion 12 shown in FIG. 2 is one seal portion having both functions when the width of the mounting groove is restricted. Like the third seal portion 12, a material having two characteristics is combined to form one seal portion, and the left ring 12a exerts oil resistance and the right ring 12b exerts cold resistance. is there.

FIG. 3 is a half sectional view of a sealing device 1C showing a third embodiment of the present invention.

In FIG. 3, the third seal portion 12 shown in FIG. 2 is mounted in the second mounting groove 3b. Further, the first mounting groove 3 in a first of the two hydrogenated nitrile rubber-made O-ring-shaped first seal portion 4 shown in FIG. 3 are arranged in parallel, the first of its two A seal ring 11 made of a resin material and having a rectangular cross section is disposed between the seal portions 4.

Further, on the atmosphere side of the first mounting groove 3a, third mounting grooves 3c are formed at intervals. A second seal portion 5 made of a hydrin rubber material is arranged in the third mounting groove 3c. The seal ring 11 is arranged in parallel with the second seal portion 5.

[0038] The sealing device 1 C is which is used in a fuel pipe system of an aircraft or the like, over or cold climates At a -
It is designed to handle temperatures above 50 ° C.

In this case, the sealing device 1C has the first mounting groove 3 so as to withstand the high pressure of the fuel oil in addition to the oil resistance and the cold resistance.
The a is configured as the two-row first seal portion 4. With respect to this high-pressure fuel, swelling due to the action of fuel oil accompanied by high pressure under the following conditions of -50 ° C in a cold region, against the cooperative action of the two first seal portions 4 and the seal ring 11. It is intended to exert a sealing effect against.

FIG. 4 is a half sectional view of a sealing device 1D showing a fourth embodiment according to the present invention.

[0041] At a 4, on the inner peripheral surface 6 of the joint portion 2, connecting section 20a of the pipe 20 is fitted. A first mounting groove 3a is formed on the right side of the joint portion 2, and a second mounting groove 3a is formed on the left side in addition to the second mounting groove 3b.
A fourth mounting groove 3d is also formed on the left side of 3b .

Then, in the first mounting groove 3a, the pipe 2
0 with the end face 20 b side first seal portion 4 made of hydrogenated nitrile rubber material is disposed of, the second seal portion 5a on the atmosphere side is made of fluorosilicone silicone rubber material is first seal portion 4 And are arranged in parallel with. Further, a seal ring 11 made of a resin material is arranged between the first seal portion 4 and the second seal portion 5a.

A first seal portion 4 made of a hydrogenated nitrile rubber material is fitted in the second mounting groove 3b on the left side of the joint portion 2. Further, a second seal portion 5a made of a fluorosilicone rubber material is fitted in the fourth mounting groove 3d on the left side thereof.

The pipe 20 constructed as described above is used as a joint in the middle of a pipe for fuel oil or the like. The left side of the joint portion 2 is fixed. The first seal parts 4, 4 made of a hydrogenated nitrile rubber material, which is inexpensive in material and excellent in oil resistance, can seal without being swollen by fuel oil and can be made of a fluorosilicone rubber material. The second seal portions 5a, 5a exert a sealing effect even at low temperatures.

FIG. 5 is a half sectional view of a connector sealing apparatus 1E showing a fifth embodiment of the present invention.

In FIG. 5, the fourth seal portion 8 includes a first seal portion 4s made of a hydrogenated nitrile rubber material and a second seal portion 5s made of a fluorosilicone rubber or a hydrin rubber material, and a support ring 14 Are integrated by. The support ring 14 is made of a resin material or a metal material such as an aluminum material or a copper material. Further, the joint surface of the support ring 14 may be formed in a concavo-convex shape, and the concavo-convex surface may be integrally baked and adhered at the time of molding.

The fourth seal portion 8 has the first seal portion 4s side arranged on the oil outflow side from the oil passage 13 side. Other configurations are substantially the same as the connector sealing device of FIG.

The fourth seal portion 8 shown in FIG. 5 prevents the low temperature on the atmosphere side from being transmitted to the first seal portion 4s by the support ring 14, and the oil on the oil passage 13 side is used as the first seal portion. Even if it leaks from the seal portion 4s, it is intended to prevent it.

[0049]

[Table 1]

Table 1 shows a comparison of the oil resistance and low temperature resistance of the conventional fluororubber with that of the material of the first seal portion 4 and the second seal portion 5 of the present invention.

Fluorine rubber has a volume change of + 10% with respect to oil, whereas hydrogenated nitrile rubber has 11% under the same conditions. Although it is recognized that they are almost the same, the price of hydrogenated nitrile rubber is much lower than that of fluororubber, which is an important factor for mass-produced products such as automobiles.

Further, fluororubber shows leakage at a sealing ability of -17 ° C against low temperature, whereas fluorosilicone rubber shows the same leakage at -60 ° C. Also, hydrin rubber gives the same leakage at -45 ° C. And hydrin rubber is cheaper than fluororubber. In the above embodiment, hydrogenated nitrile rubber is used as a preferable example because it has excellent oil resistance, but nitrile rubber is generally excellent in oil resistance. Further, hydrin rubber or fluorosilicone rubber is a preferable example having excellent cold resistance.

[0053]

According to the connector sealing device of the present invention, the first seal portion, which is inexpensive and has excellent oil resistance, is disposed on the side that comes into direct contact with oil. ,
The sealing ability can be exhibited without a decrease in elongation. Further, since the second seal portion, which is also inexpensive and has excellent cold resistance, is provided on the atmosphere side, it is possible to exhibit the sealing ability even at low temperature while supplementing the drawbacks of the first seal portion. Is.

In the state of the art, it has been found that no material having excellent oil resistance and cold resistance was found.
Both the seal portion and the second seal portion are inexpensive, and the cooperation between the seal portion and the second seal portion makes it possible to exert the oil resistance and cold resistance ability of the composite material. Therefore, it is suitable as a sealing device for mass-produced connectors of automobiles and the like, and has excellent durability and, in a cold region, exhibits a sealing ability not only against a low temperature but also excellent in pressure resistance.

In the present invention , when the seal ring is provided between the first seal portion and the second seal portion ,
It is, for the first seal portion, and holds a stable elastically deformed state against the operating pressure of the second sealing portion with respect to the oil exhibits sealing capability. Further, the second seal portion is prevented from being affected by low temperature on the first seal portion, and is prevented from entering from the outside in cooperation with the second seal portion.

Further , in the present invention , the support ring supports the first seal portion so as to exert the sealing ability, and the second seal portion supports the first seal portion against a low temperature. The effect of minimizing the impact on

In the present invention , when the mounting groove of the third seal portion is restricted in location and the mounting groove is small, the characteristics of both materials are exhibited as a composite material to provide some sealing ability. The effect that can be adapted to the conditions of.

[Brief description of drawings]

FIG. 1 is a half sectional view of a connector sealing device showing a first embodiment according to the present invention.

FIG. 2 is a half sectional view of a connector sealing device showing a second embodiment according to the present invention.

FIG. 3 is a half cross-sectional view of a connector sealing device showing a third embodiment according to the present invention.

FIG. 4 is a half cross-sectional view of a connector sealing device showing a fourth embodiment of the present invention.

FIG. 5 is a half cross-sectional view of a connector sealing device showing a fifth embodiment of the invention.

FIG. 6 is a sectional view of a conventional connector sealing device.

[Explanation of symbols]

1 Sealing device 20
Piping 2 joint section 20a
Connection end 3 First mounting groove 20b
End face 4 First seal portion 21
Device 5 Second seal part 21a
Pipe 5a Second seal part 50
Sealing device 6 Inner peripheral surface 51
Joint part 7 outer peripheral surface 51a
Threaded portion 8 Fourth seal portion 51b
Step 9 Caulking groove 52
O-ring 10 step surface 53
Spacer 11 Seal ring 54
O-ring mounting groove 12 Third seal portion 55
Fastener 13 Oil passage 56
Bite ring 14 support ring 56a
Locking portion 3a First mounting groove 70
Piping 3b Second mounting groove 70a
Pipe end 3c Third mounting groove 3d Fourth mounting groove

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Claims (4)

(57) [Claims] 1. A connector sealing device for sealing the interval fitting of the joint portion connecting the connecting portion of the pipe having an oil path therein, communicates with the oil passage of the connecting portion and the connecting portion of the pipe The joint portion that connects the mating connection portion and the joint portion or the joint portion of the joint portion .
And comprising a mounting groove of the annular fitting the seal portion ring-shaped in between mating with the mating connection portion, of the nitrile rubber-made annular side oil flowing from the oil passage of said mounting groove first No. 1 seal portion is arranged , and a predetermined space is provided on the atmosphere side from the first seal portion.
Excellent cold resistance than that of the first seal portion Te rubber material made of
A connector sealing device comprising an annular second seal portion. 2. The sealing device for a connector according to claim 1, wherein a seal ring made of a resin material is arranged between the first seal portion and the second seal portion. 3. A disposed on the first seal portion side oil flowing out of the oil passage as well as integrated via the first seal portion and the second seal portion and the support ring The connector sealing device according to claim 1, wherein the sealing device is a connector. 4. The mounting groove comprises an annular first mounting groove and a second mounting groove.
Of comprising a mounting groove, wherein together with the oil from the oil passage of the first mounting groove is disposed a first seal part is an O-ring made of nitrile rubber material on the side of the outlet, the first Tokoro to the atmosphere side of the seal part
A second seal portion, which is an O-ring made of a rubber material, which is more excellent in cold resistance than the first seal portion, is arranged at regular intervals, and a third seal portion is provided in the second mounting groove. was placed, the third sealing portion is cold resistance than that of the first seal portion and the other substantially half together with the oil from the oil passage to the nitrile rubber made of substantially half of the side of the outflow of the cross section 2. The sealing device for a connector according to claim 1, wherein the sealing device is made of a rubber material having excellent properties and integrated.