Fluid handling – Systems – Flow path with serial valves and/or closures
Reexamination Certificate
1999-07-22
2001-01-09
Lee, Kevin (Department: 3753)
Fluid handling
Systems
Flow path with serial valves and/or closures
C137S614040
Reexamination Certificate
active
06170522
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a self-sealing-type double tube joint having a pair of tubular outer shells, each of which has a tubular inner barrier wall fixed therein so as to form a double flow passage, i.e. an inner flow passage and an outer flow passage, and a movable valve element inserted between the barrier wall and the outer shell and/or inserted in the barrier wall with interposing a sealing member so as to be urged forward by a spring device. The inner passages are connected mutually and the outer passages are connected mutually independently, by combining the pair of outer shells so that the tubular barrier walls push the movable valve elements. Such double tube joint is used for high or low pressure pipes for refrigerant cycle of a separate-type air-conditioner, oil pipes for hydraulic circuit, fuel feeding pipes, and the like.
BACKGROUND OF THE RELATED ART
Such types of double tube joints are disclosed in Jikkai Sho-51 No. 161619 (Unexamined Japanese utility model publication No. 161619/1976) and Jikkai Hei-5 No. 30687 (Unexamined Japanese utility model publication No. 30687/1994).
In those known joints, the outer flow passages are connected mutually by jointing a male outer shell to the female outer shell so as to push movable valve elements arranged on tubular barrier walls backward. Further, the inner flow passages are connected mutually by abutting valve rods which are urged forward in the tubular barrier walls so as to push mutually rearward. Therefore, at a step when the male and female outer shells are connected mutually, though the movable valve element in the outer passage side becomes in contact with the outer shell, the valve rods should be in a state where the rods do not yet push mutually, since a space for enabling the valve rods to be projected is required at the abutting portion. In the state where a union nut is screwed, the movable valve elements go back to connect the outer passages mutually. However, air in the space between the ends of rods in the inner passages cannot escape out. Then, the valve rods go back and the inner passages are connected through with enclosing the air in the inner passages.
Therefore, when the double tube joint is used for the above-mentioned air-conditioner, hydraulic oil pipes or fuel feeding pipes, the air is undesirably entered and mixed in the fluid in the pipes at the step that the inner passages are connected mutually. Especially, in the case of a joint used in a refrigerant cycle pipes for a separate-type air-conditioner, moisture in the air is frozen and the system becomes unserviceable.
SUMMARY OF THE INVENTION
The object of the present invention is to improve such self-sealing-type double tube joint which has a pair of tubular outer shells
11
,
21
, each of which has a tubular inner barrier wall
12
,
22
fixed therein so as to form a double flow passage having inner flow passage
1
and outer flow passage
2
, and a movable valve element
31
,
41
,
51
inserted between the barrier wall and the outer shell and/or inserted in the barrier wall with interposing a sealing member so as to be urged forward by a spring device. The inner passages
1
and the outer passages
2
are connected independently, by combining the pair of outer shells
11
,
22
mutally so that the inner barrier walls
12
,
22
push the movable valve elements
31
,
41
,
51
.
That is to say, the object of the invention is to provide an improvement that the inner passages and outer passages are jointed at the same time without entraining outside air when the outer shells are combined mutually.
In accordance with the present invention, there is provided an improvement in a self-sealing-type double tube joint which has a pair of tubular outer shells
11
,
21
, each of which has a tubular inner barrier wall
12
,
22
fixed therein so as to form a double flow passage having inner flow passage
1
and outer flow passage
2
, and a movable valve element
31
,
41
,
51
inserted between the barrier wall and the outer shell and/or inserted in the barrier wall with interposing a sealing member so as to be urged forward by a spring device. The inner passages
1
and the outer passages
2
are connected independently, by combining the pair of outer shells
11
,
22
mutally so that the inner barrier walls
12
,
22
push the movable valve elements
31
,
41
,
51
. The improvement is characterized that the joint is constructed such that the outside air in a contacting sealed portion flow out of the tubular barrier wall without staying, before the tubular inner barrier walls
12
,
22
become in contact with the movable valve elements
31
,
41
,
51
so as to dam the contacting sealed portions of the inner flow passages
1
and the outer flow passages
2
from outside air. Therefore, outside air can be prevented from being entered and mixed in the inside of the outer flow passage
2
and inner flow passage
1
when the outer flow passages
2
and inner flow passages
1
are respectively connected. As a result fluid in the pipings system can be prevented from leakage to outside during joint of the double tube joint, and therefore, a piping joint capable of keeping the purelity of the fulid in the pipings can be realized.
In a preferable joint of the present invention, front ends of the tubular inner barrier walls
12
,
22
and front ends of the movable valve elements
31
,
41
,
51
construct abutting surfaces in the pair of outer shells
11
,
21
, and the abutting surfaces are closely contacted before combine of the pair of outer shells
11
,
21
are progressed to connect the inner flow passages
1
mutually and to connect the outer flow passages
2
mutually. Therefore, the outside air which tend to stay in the outer shells
11
,
21
can be compulsorily discharged out of the outer shells
11
,
21
, and the outside air can be securely prevented from being mixed in the inner flow passage
1
and the outer flow passage
2
.
In another preferable joint of the invention, the pair of outer shells
11
,
21
are a female outer shell
11
and a male outer shell
21
, and a front end surface of the male outer shell
21
is placed on a plane on which a front end surface of the tubular inner barrier wall
22
and a front end surface of the movable valve element
41
are placed. Therefore, construction is simple, portions to be sealed is reduced, and low cost and advantage of reliance of air-tightness can be realized.
In further another joint of the invention, the pair of outer shells
11
,
21
are a female outer shell
11
and a male outer shell
21
, the male outer tubular shell
21
has a tubular barrier wall
22
having a closed front end
23
, an opening of a side passage
24
is formed in a side wall of the tubular barrier wall
22
in the male outer shell
21
, a tubular or ring-like movable valve element
41
is mounted on the tubular inner barrier wall
22
so that the valve element
41
shuts the side passage
24
and faces against a front end surface of a tubular barrier wall
12
of the female outer shell
11
, a gap portion
42
is formed between a rear outer face of the movable valve element
41
and an inner surface of the male outer shell
21
to connect with an outer flow passage
2
, another tubular or ring-like movable valve element
51
is mounted on an inner tubular barrier wall
12
in the female outer shell
11
so as to face against an end surface of the male tubular outer shell
21
, another gap
13
is formed between the tubular inner barrier wall
12
and the movable valve element
51
to connect with the outer tubular passage
2
, a center valve element
31
is inserted in a front area of the tubular barrier wall
12
so as to face against a front end of the tubular barrier wall
22
in the male outer shell
21
, and the center movable valve element
31
has a side wall through which a side passage
32
is opened to connect with the inner flow passage
1
, and the center movable valve element
31
has an enlarged portion
33
at a portion rear of the side passage
32
, whereby the inner flow p
Armstrong, Westerman Hattori, McLeland & Naughton
Kyoseki Sangyo Co., LTD
Lee Kevin
LandOfFree
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