JP3711479B2 - Pipe fitting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe joint for connecting gas transfer pipes (hose, tube, etc.) to each other.
[0002]
[Prior art]
Some automobiles use, for example, natural gas (hereinafter referred to as a gas body) as fuel. When the fuel is filled into the automobile, the gas body storage tank and the automobile side are used to prevent the gas body from being released into the atmosphere. The gas supply parts are connected to each other in an airtight state via a transfer hose. In other words, it is necessary not only to insert a filling gun into the gasoline supply port as in the case of filling ordinary gasoline into an automobile, but also to fix the filling gun to the gasoline supply part on the automobile side in an airtight state when filling the gas body. I must.
[0003]
For this reason, the transfer hose has a constant separation force between the male and female members (automobile) in order to avoid damage to the transfer hose and gas storage tank when the automobile is accidentally started with the hose connected. (Tensile force + tensile force due to fluid pressure) is provided, and a pipe joint that automatically separates from each other is provided.
[0004]
However, in the above pipe joint, when the fluid pressure is acting and when it is not acting, the magnitude of the tensile force from the automobile required for the separation of the male and female members is different. The said tensile force will become quite large. That is, in the latter case, when the vehicle is started with the hose connected, a large tensile force from the vehicle acts as an impact force on the transfer hose or the gas storage tank immediately before the male / female member is separated. There is.
[0005]
In this type of pipe joint, when the male and female members are separated, both are closed. However, immediately before the separation, a gas body enters between the male and female members, and this gas The male member may jump out of the female member with a strong force due to body pressure. Such a separation mode is very dangerous for those working nearby.
[0006]
[Problems to be solved by the invention]
Therefore, in the present invention, regardless of whether or not the pressure of the gas body acts, there is no great difference in the tensile force required to separate the male and female members, and the male member is the female member when the male and female members are separated from each other. It is an object of the present invention to provide a pipe joint that does not jump out from the momentum.
[0007]
[Means for Solving the Problems]
The pipe joint of the present invention is a pipe joint that is connected in such a manner that the insertion cylinder portion 10 of the male member A is inserted into the female member B, and the insertion cylinder portion 10 has its back end closed and an insertion cylinder. A through-hole 12 is formed on the peripheral surface of the portion 10 to allow a gas body from the fluid path R of the female member B to reach the inside of the cylinder. The portion is set to have the same diameter, and the back and front sides of the fluid path R in the female member B are set to the same hole diameter, and the insertion tube portion is located in the back and front sides of the fluid path R in the female member B. The same O-ring that is airtight between the male and female members is mounted, and the male / female member is passed through the O-ring on the near side of the through-hole 12 during the separation of the male / female member. The gas body flowing between the female members A and B is less of the male and female members A and B. Kutomo are then allowed to escape from the gas vent passage GH formed in one.
[0008]
This pipe joint functions as follows.
In this pipe joint, the gas body reaches the inside of the cylinder from the through hole 12 formed in the peripheral surface of the insertion cylinder portion 10, and the back side and the front side of the through hole 12 in the insertion cylinder portion 10. The side portion is set to the same diameter, the rear side and the front side of the fluid path R in the female member B are set to the same hole diameter, and the insertion tube is placed in the back side and the front side of the fluid path R in the female member B. Since the same O-ring for airtightness with the part 10 is mounted, the pressure balance in the axial direction of the gas body acting on the insertion cylinder part 10 is in a balanced state. Even when the body flows from the female member B to the male member A, the moving force in the axial direction does not act on the male member A against the female member B.
[0009]
Therefore, in this pipe joint, the tensile force required to separate the male and female members between when the gas body pressure is acting and when it is not acting is no different from the friction force due to the O-ring or the like. .
[0010]
On the other hand, when passing through the O-ring on the near side of the through hole 12 in the middle of the male / female member separation, the gas body flowing over the O ring or between the male / female members A and B from the through hole 12 Since it escapes from GH, the pressure of the gas body does not act between the male and female members A and B when the male and female parts A and B are separated from each other. There is no such thing as jumping out of the member B with intense momentum.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 shows a fuel supply device S dedicated for automobiles that uses natural gas as a fuel, and is provided with the pipe joint J of the present invention. The automobile was started accidentally with the filling gun G connected to the automobile. In this case, the male member A and the female member B are automatically separated from each other by the action of a certain tensile force on the pipe joint J, which causes the fuel transfer hose H to be torn off or the gas supply device main body S. It is possible to avoid the situation that damages.
[0013]
As shown in FIG. 2, the pipe joint J basically includes a male member A having an insertion cylinder portion 10 and a female member B including a female main body 2 and an inner cylinder 3. The parts 10 are connected in such a manner that they are inserted into the inner cylinder 3.
[0014]
As shown in FIG. 4, the male member A has a cylindrical shape composed of a hexagonal tool-corresponding portion 13 and an insertion tube portion 10 provided continuously therewith. As shown in FIG. 4, the insertion tube portion 10 is composed of a large-diameter portion 10a and a small-diameter portion 10b. The large-diameter portion 10a is formed with a circumferential groove 11 that becomes wider toward the outer peripheral surface. In addition, three rows of through-holes 12 are formed in the axial direction in a portion that is slightly more paragraphed than the small-diameter portion 10b.
[0015]
Further, as shown in FIG. 4, the male member A has a valve mechanism 6 for preventing the gas body from being released to the outside when the male / female members A and B are in a separated state. The valve mechanism 6 includes a valve body 60 having a valve main body 60a, a guide shaft 60b, and an extension shaft 60c, and a guide shaft for moving the valve body 60 forward and backward on the axis of the male member A, as shown in FIG. A guide member 61 having a flow hole 61a for holding the gas body 60b and allowing a gas body to flow, a snap ring 62 for preventing the guide member 61 from coming out outward, and the valve body 60 for the male member A It is comprised from the compression coil spring 63 provided between the valve body 60 and the guide member 61 in order to urge to the insertion end side. In the valve mechanism 6, when the male / female members A and B as shown in FIG. 2 are in the connected state, the valve mechanism 6 is opened by pushing against the extension shaft 70 c on the female member B side. When the female members A and B are in the separated state, the valve is closed by the elastic return force of the compression coil spring 63.
[0016]
As shown in FIGS. 2 and 4, the female member B includes a female main body 2 and an inner cylinder 3 that is housed in the female main body 2 so as to freely advance and retract. The inner cylinder 3 is a compression coil spring 22. Is biased toward the back side.
[0017]
As shown in FIG. 4, the female main body 2 is composed of cylinders 2a, 2b, 2c and a cylindrical flow path forming body 5 sandwiched between the cylinders 2b, 2c.
[0018]
As shown in FIG. 4, the cylindrical body 2a has a cylindrical shape in which a circumferential groove 20a is provided at the front side end, and a female screw portion 21a for screw coupling with the cylindrical body 2b is formed at the back side end portion. It is.
[0019]
As shown in FIG. 4, the cylindrical body 2b is formed in two stages of an outer diameter portion of small and large diameter portions 20b and 21b, and an inner peripheral portion of three small diameter, medium and large diameter hole portions 23b, 24b and 25b. It is formed in steps. In addition, in the cylindrical body 2b, as shown in FIG. 4, the large diameter portion 21b is provided with a male screw portion 26b, and the large diameter hole portion 25b has a female screw portion 27b for screw coupling with the cylindrical body 2c. Further, an O-ring mounting circumferential groove 28b is provided on the wall surface of the small-diameter hole 23b, and the O-ring mounting circumferential groove 28b is connected to the small-diameter portion 10b as shown in FIG. An O-ring 29b is attached to ensure gas tightness between the small-diameter hole 23b.
[0020]
As shown in FIG. 4, the cylindrical body 2c has a cylindrical shape composed of a hexagonal tool-corresponding portion 20c and a male screw portion 21c, and a circular screw portion corresponding to the end portion has a female screw for connecting a hose. A portion 22c is formed. Further, as shown in FIG. 4, a valve mechanism 7 that prevents the gas body from being released to the outside when the male / female members A and B are in a separated state is disposed in the cylindrical body 2c. As shown in the figure, the valve mechanism 7 includes a valve body 70 having a valve main body 70a, a guide shaft 70b, and an extension shaft 70c, and a guide shaft 70b for moving the valve body 70 forward and backward on the axis of the male member A. The guide member 71 having a flow hole 71a that allows the flow of the gas body, the snap ring 72 that prevents the guide member 71 from being pulled outward, and the valve body 70 of the male member A. A compression coil spring 63 is provided between the valve body 70 and the guide member 71 so as to be biased toward the insertion end. In this valve mechanism 7, when the male / female members A and B as shown in FIG. 2 are in the connected state, the valve mechanism 7 is opened by pushing against the extension shaft 60c on the female member A side. When the female members A and B are in the separated state, the valve is closed by the elastic return force of the compression coil spring 73.
[0021]
As shown in FIGS. 2 and 4, the flow path forming body 5 has an outer peripheral portion formed in three stages of small, medium, and large diameter portions 50, 51, and 52, and an inner peripheral portion of the small and large diameter hole portion 53. , 54 are formed in two stages. Further, in this cylindrical body 2c, as shown in FIG. 4, a plurality of flow paths 55 parallel to the cylindrical axis are provided in the thick portions of the medium diameter portion 51 and the large diameter portion 52, and in the radial direction. A perforated air vent hole 56 (communication with the air vent hole AH formed in the cylindrical body 2b) is provided. Further, an O-ring mounting circumferential groove 57 is provided in front of the large-diameter portion 54. The O-ring mounting circumferential groove 57 has a small-diameter portion 10c and a large-diameter hole as shown in FIGS. An O-ring 58 is attached to ensure gas tightness with the portion 54.
[0022]
Here, in the assembled state of the cylinders 2a, 2b, 2c, the small-diameter hole portion 23b and the large-diameter hole portion 54 have the same hole diameter, and the O-ring mounting circumferential groove 28b and the O-ring mounting circumferential groove 57, The O-ring 29b and the O-ring 58 are set to be the same.
[0023]
As shown in FIG. 4, the inner cylinder 3 is a cylindrical shape having both ends open and having a flange on the back end, and in the vicinity of the front end, a trumpet shape that expands from the inner peripheral surface toward the outer peripheral surface. The circular holes 30 are provided at equiangular intervals. The circular holes 30 are provided with the spheres 4 so as to be able to appear and retract with respect to the inner and outer surfaces of the cylindrical wall.
[0024]
In this embodiment, as shown in FIG. 3 and FIG. 5, the gas vent passage GH is constituted by the through hole 31 provided in the inner cylinder 3 and the through hole 29 provided in the cylinder 2a. When the parts A and B are separated from each other, the pressure of the gas body does not act between the male and female members A and B.
[0025]
2 and 4, reference numerals 19 and 59 are O-rings.
Since the pipe joint J of this embodiment has the above-described configuration, when the automobile is erroneously started with the filling gun G connected to the automobile, the male member A is used in the following modes (1) and (2). And the female member B are separated from each other.
(1). A separation force corresponding to the starting force of the automobile acts between the male member A and the female member B. Then, the male member A and the inner cylinder 3 are moved together as shown in FIG. 3 against the urging force of the compression coil spring 22 due to the presence of the sphere 4.
(2). And if the inner cylinder 3 is moved only a fixed distance with the movement of the male member A, the spherical body 4 will be pushed outward by the inclined wall which comprises the circumferential groove 11, and will fit in the circumferential groove 20a. In this state, the sphere 4 is completely escaped from the circumferential groove 11, and the engagement between the inner cylinder 3 and the male member A by the sphere 4 is completely released. Therefore, the male member A is separated from the female member B as it is.
[0026]
Further, in this pipe joint J, the gas body flows from the female member B to the male member A along the path of the arrow Y shown in FIG. 2, but in the assembled state of the cylinders 2a, 2b, 2c, the small diameter hole portion 23b. And the large-diameter hole portion 54 have the same hole diameter, and the O-ring mounting circumferential groove 28b and the O-ring mounting circumferential groove 57, and the O-ring 29b and the O-ring 58 are set to be the same. As described in the column, the moving force in the axial direction does not act on the female member B on the male member A when the gas body flows into the insertion tube portion 10 through the through hole 12.
[0027]
On the other hand, in this pipe joint, the male / female members A, shown in FIG. 3 and FIG. 5 cross the O-ring 29b or pass from the through-hole 12 when passing through the O-ring 29b of the through-hole 12 during the male / female member separation. Since the gas body flowing in between B is escaped from the gas vent passage GH formed in the female member B, the male and female members A and B are separated from each other when the male and female parts A and B are separated from each other. Therefore, the pressure of the gas body does not act on the male member A, and therefore, the male member A does not jump out of the female member B with a strong force.
[0028]
In addition, it can replace with the gas vent path GH given to the pipe joint of the said embodiment, and can be made into the gas vent path GH shown in FIG.6 and FIG.7.
[0029]
As shown in FIGS. 6 and 7, the gas vent passage GH is configured by a groove extending in the cylinder axis direction on the inner peripheral surface of the inner cylinder 3, and gas flowing between the male and female members A and B The body is released to the atmosphere through this groove. Therefore, there exists an effect similar to the thing of above-described embodiment.
[0030]
Further, the gas vent passages GH of the two pipe joints described above are both formed on the female member B side. However, the present invention is not limited to this, and can be formed on the male member A. You may make it provide in both members A and B.
[0031]
【The invention's effect】
From the contents described in the column of means for solving the problems, there is no great difference in the tensile force required to separate the male and female members regardless of whether the pressure of the gas body acts, and the male and female members It was possible to provide a pipe joint in which the male member does not jump out of the female member with great force when separated from each other.
[Brief description of the drawings]
FIG. 1 is an external view of a fuel supply device provided with a pipe joint according to an embodiment of the present invention.
FIG. 2 is a half cross-sectional view when the male and female members of the pipe joint are in a connected state.
FIG. 3 is a half sectional view showing a state in which the male member of the pipe joint is in the middle of being removed from the female member.
FIG. 4 is a half cross-sectional view when the male and female members of the pipe joint are in a separated state.
5 is a cross-sectional view of the main part in FIG.
FIG. 6 is a cross-sectional view showing a gas vent passage formed in a pipe joint according to another embodiment of the present invention.
7 is a cross-sectional view taken along the line XX in FIG.
[Explanation of symbols]
A Male member B Female member R Fluid path 10 Insertion cylinder part 12 Through-hole GH Degassing path

Claims (1)

It is a pipe joint that is connected in such a manner that the insertion tube portion (10) of the male member (A) is inserted into the female member (B), and the insertion tube portion (10) is inserted while the back end is closed. A through-hole (12) is formed in the peripheral surface of the cylinder part (10) to allow the gas body from the fluid path (R) of the female member (B) to reach the inside of the cylinder. The insertion cylinder part (10) The rear side and the front side of the through hole (12) are set to have the same diameter, the rear side and the front side of the female member (B) are set to the same hole diameter, and the female member ( B) Install the same O-ring that is airtight between the insertion tube portion (10) on the back side and the near side of the fluid path (R) in FIG. When passing the O-ring on the near side of the hole (12), the male / female member (A) ( ) The body of gas flowing therebetween, the male and female member (A) (B) pipe joint, wherein you have to escape from the venting passage formed in at least one (GH) of the.

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