JP3238171B2 - Liquefied gas filling nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied gas filling nozzle for filling a container such as a liquefied gas cylinder with a liquefied gas.

[0002]

2. Description of the Related Art Conventionally, when a liquefied gas cylinder is filled with a liquefied gas, a liquefied gas filling nozzle connected to a liquefied gas supply unit is attached to a nozzle receiving port of the liquefied gas cylinder, and then an opening / closing valve of the liquefied gas cylinder is opened. I was

FIGS. 13 and 14 show a conventional liquefied gas filling nozzle. A moving portion 65 including a valve body 62, a piston 63, a rear spindle 64, and the like is provided inside a cylindrical nozzle body 61 so as to be movable in the front-rear direction (lateral direction in the drawing). This moving section 65
The compressed air is moved in the direction A against the spring member 68 by injecting compressed air into the air chamber 67 partitioned by the flam member 66. A valve spindle 69 protruding forward is disposed inside the valve body 62 so as to be retractable, and is urged forward by a pressing spring 70. A sealing seat member 71 and a mounting member 72 are fixed to the rear end of the valve spindle 69, and the sealing seat member 71 is in contact with the inclined wall 62 a of the valve body 62. In FIG. 13, reference numeral 73 denotes a hook for hooking the valve portion 74 of the liquefied gas cylinder, 79 denotes a nozzle port of the valve portion, and 74 and 75 denote rubber ring-shaped applicators having a rectangular cross section attached to the tip of the valve spindle 69 ( Liquefied gas passages formed in the valve spindle 69 and the rear spindle 64, respectively.
In 4, 78 is an air inlet.

When filling the liquefied gas, first, the hook 7
3 is hooked on the valve portion 74 of the liquefied gas cylinder so that the valve spindle 69 is opposed to the nozzle port 79, and then compressed air is injected into the air chamber 67 to move the moving member 65 in the A direction. When the ring-shaped applicator 75 at the tip of the valve spindle 69 comes into contact with the nozzle port 79 and the valve spindle 69 moves relatively rearward with respect to the valve body 62, the sealing seat member 71 is moved to the valve body 6.
The second inclined wall 62a is separated from the second inclined wall 62a. As a result, the liquefied gas introduction passage is opened, and the liquefied gas is charged into the liquefied gas cylinder via the liquefied gas filling nozzle and the on-off valve.

[0005]

However, according to the above-mentioned conventional structure, when the mounting direction of the liquefied gas charging nozzle is shifted or the mounting is incomplete, the ring-shaped applicator for the liquefied gas charging nozzle is used. The state of close contact between the nozzle 75 and the nozzle port 79 of the liquefied gas cylinder deteriorates, and the liquefied gas may leak to the outside. Therefore, when mounting the liquefied gas charging nozzle, a person must confirm that the liquefied gas has not leaked, and safety has been insufficiently secured.

The present invention solves the above-mentioned problem, and provides a liquefied gas charging nozzle which does not have a risk of liquefied gas leaking to the outside even when the mounting is incomplete or the mounting direction of the liquefied gas charging nozzle is shifted. The purpose is to do.

[0007]

In order to solve the above-mentioned problems, a first means of the present invention is connected to a liquefied gas supply section having a shut-off valve, and presses the tip against a nozzle receptacle of a container to be filled. A liquefied gas filling nozzle for filling the liquefied gas into the container, an engagement arm for engaging the engaged portion of the container to draw the cylindrical nozzle body toward the nozzle receiving port, and A piston portion that is projected to be retractable and urged in the projecting direction by the pressing member, a contact tool provided at the tip of the piston portion and closely contacted with the nozzle port, and penetrates the contact tool and the piston portion An injection pipe that is installed so that it can move back and forth, and whose tip projects toward the injection port of the nozzle port when the nozzle body is pulled toward the nozzle port, Projected beyond a certain amount Is obtained by a detection unit for opening the Motojime valve detects this to.

[0008] The second means of the present invention is the first means.
, The abutment provided at the tip of the piston is spherical
It has a part .

[0009]

When the engagement arm is engaged with the engaged portion of the container to be filled by the first means and the nozzle body is drawn toward the valve connection port, the abutment comes into contact with the nozzle receptacle and the injection pipe is brought into contact. Project from the piston part. Then, when the injection pipe protrudes from the piston portion by a predetermined amount or more, the detection section detects this and opens the base valve. That is, by setting the amount of protrusion at the time of opening to a value close to the amount of final protrusion at the time of mounting,
The liquefied gas is filled only when mounting is securely performed.

According to the second means, even if the mounting direction of the liquefied gas charging nozzle is slightly shifted, the spherical member is provided on the abutment, so that it is easy to come into close contact with the nozzle port of the container to be filled.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. 2 and 3, 1 is carried into a predetermined place,
A liquefied gas filling facility for filling the liquefied gas cylinder 2 with the liquefied gas.
And a liquefied gas filling nozzle 7 for filling the liquefied gas from the nozzle port 6 of the liquefied gas cylinder 2. The lifting table 3 is moved by a lifting cylinder 10 mounted on a stand 8 via a bracket 9.
It is raised and lowered while being guided by the guide rod 11 and the guide member 12.

The valve opening / closing device 5 includes a rotating unit 15 rotatably supported by the lift 3 and rotated about a vertical axis a by a rotating motor 14 via gears 13A and 13B.
And a clamp portion 17 provided below the rotating portion 14 for rotating the handle 16 of the open / close valve 4 while pressing and holding the handle 16. The open / close valve 4 is opened and closed by driving the clamp portion 17. I have.

A rotary unit 18 for rotating the liquefied gas filling nozzle 7 in the direction b via an arm member 19 is provided on the lift 3.
Are supported rotatably about a horizontal axis c. A rotation motor 21 is connected to the rotation unit 18, and the liquefied gas filling nozzle 7 is rotated by driving the rotation motor 21.

As shown in FIGS. 4 and 5, a scissor-shaped engaging arm 22 is attached to the liquefied gas filling nozzle 7 via a bracket 23. Engagement arm 22
An opening / closing cylinder device 24 and an extension / retraction rod 24a thereof are attached to the rear end of the arm. A fan-shaped engagement member 25 is pivotally mounted on the tip of the engagement arm 22 in the direction d around a pin 26. Mounted freely. This engagement member 25
Is configured to contact and roll with the cylindrical portion 27 of the opening / closing valve 4 (see FIGS. 6 and 7), and the engaging member 25 is provided with a spring (not shown) provided at the distal end of the engaging arm 22. ) Makes it possible to return to the position shown in FIGS. 5 and 6.

As shown in FIG. 1, the liquefied gas filling nozzle 7
Has a configuration in which the piston portion 32 is inserted into the nozzle main body 20 which is configured by bolting the first to fourth component members 28, 29, 30, and 31 in the front-rear direction,
The piston part 32 protrudes forward from the nozzle body 20. Between the third component member 30 on the rear side of the nozzle body 20 and the rear recess 32a of the piston portion 32, a first spring 33 having a large pressing force, a second spring 34 having a small pressing force, and A mounting member 35 is provided.
Then, the piston portion 32 is urged forward by the first and second springs 33 and 34, and a step portion 32 b formed on the central outer surface of the piston portion 32 is formed on the first component member 28 of the nozzle body 20. The position is regulated by contacting the rear protruding portion 28a.

At the front end of the piston portion 32, there is provided a patch 35 which is in close contact with the nozzle port 6. The patch 35 is spherical and has elasticity. In the piston part 32, an injection pipe 36 penetrating through the piston part 32 and the abutment 35 is provided.
Are provided to be able to move back and forth. The rear end peripheral surface portion of the injection pipe 36 is in contact with the step portion 30a of the third component member 30, and the rearward movement is restricted. Further, the front end and the rear end of the injection pipe 36 are opened in a flared shape, and a needle valve 38 urged forward by a third spring 37 is pressed against the rear end opening of the injection pipe 36. Needle valve 38
A disk 39 is attached to the rear end of the piston rod 32. A first rod member 40, a fourth spring 41, and a second rod member 42 are disposed between the disk 39 and the rear end of the piston portion 32. I have. The front end of the second rod member 42 is partially extended and inserted into the fourth spring 41.

Further, as shown in FIG. 8, a liquefied gas communication passage 43 for communicating a liquefied gas supply unit 50 having a base valve 51 and a space in which the needle valve 38 is provided is formed in the nozzle body 20. The first air signal passage 44 and the second detection unit, which communicate with each other when the piston unit 32 retreats relatively to the nozzle body 20 to the position shown in FIG. 9 or FIG. The air signal passage 45 is formed. In FIG. 8, reference numerals 46 and 47 denote the first air signal passage 44 or the second air signal passage 44.
An inflow passage for supplying air to the air signal passage 45 is shown in FIG. 1. In FIG. 1, reference numeral 48 denotes a groove formed in the outer circumferential direction of the outer surface of the piston portion 32. Make air communicate.

In the above configuration, when the liquefied gas cylinder 2 is conveyed to the liquefied gas filling facility and the nozzle port 6 of the on-off valve 4 is arranged in a predetermined direction, the elevator 3 is first lowered and lowered. The handle 16 of the opening / closing valve 4 is clamped by the clamp 17 of the valve opening / closing device 5.

Next, the liquefied gas filling nozzle 7 is turned obliquely downward, and the abutment 35 of the piston part 32 is turned on and off.
Is pressed against the nozzle port 6. That is, as shown in FIG. 6, after the liquefied gas filling nozzle 7 is rotated to a position where the contacting tool 35 contacts the nozzle port 6, the engaging arm 22 is closed, and the fan-shaped engaging member 25 is opened and closed. The abutment with the cylindrical portion 27 of the valve 4 causes the valve 4 to roll in the direction e,
2, the nozzle body 20 is drawn forward (f direction).

When the nozzle body 20 is pulled forward, as shown in FIG. 9, the injection tube 36 also moves forward, while the piston 32 is brought into contact with the nozzle 34 by the abutment 34. Does not move forward due to
It retracts relatively to the nozzle body 20 while contracting the spring 33. At this time, the first rod member 40 comes into contact with the second rod member 42, and the inflow passage 46 of the nozzle body 20 and the first air signal passage 44
Are communicated through the groove portion 48 of the main body. Thus, it is detected that air flows into the first air signal passage 44 and the injection pipe 36 is protruding from the patch 35.

When the nozzle body 20 is further pulled forward, as shown in FIG. 10, the first spring 33 and the second spring 34 are contracted and the piston portion 32 is contracted.
Retreats relatively largely with respect to the nozzle body 20, and at the same time, the first and second rod members 40 and 42 and the disc 39
The needle valve 38 retreats relatively to the nozzle main body 20 via the nozzle, and separates from the rear end of the injection pipe 36. Thereby, the liquefied gas supply path in the liquefied gas filling nozzle 7 is opened via the liquefied gas communication passage 43. At the same time, the inflow passage 47 of the nozzle body 20 and the second air signal passage 45 are communicated with each other through the groove 48 of the piston portion 32, air flows into the second air signal passage 45, and the injection pipe 36 hits. Liquefied gas nozzle filling device 7
Is surely attached to the nozzle port 6 of the opening / closing valve 4. Thereby, the base valve 51 of the liquefied gas supply unit 50 is opened.

Thereafter, the clamp unit 1 of the valve opening / closing device 5
7 is rotated to open the on-off valve 4, and the liquefied gas is safely filled into the liquefied gas cylinder 2 without leaking.
Here, since the abutting tool 34 at the tip of the piston portion 32 has a spherical shape, even if the insertion direction of the piston portion 32 is slightly shifted, it can be in close contact with the nozzle port 6 of the opening / closing valve 4, thereby preventing leakage of the liquefied gas. Thus, the degree of freedom in the insertion direction of the nozzle insertion member such as the piston part 32 could be greatly increased. That is, a simple nozzle 53 (FIG. 12) having no retractable piston portion 32 or the like as in this embodiment.
The same effect can be obtained by providing an abutment 54 having a spherical portion at the tip of (See FIG. 2). In FIG. 12, reference numeral 55 denotes a nozzle port.

In the above embodiment, in addition to the detection mechanism using the groove 48 of the piston portion 32 and the second air signal passage 45, a separation mechanism of the needle valve 38 is used.
Although the case where the gas leakage is prevented when the liquefied gas filling nozzle 7 is incompletely mounted has been described, the gas leakage can be prevented by employing only one of the mechanisms.

[0024]

As described above, according to the present invention, when the nozzle body is drawn toward the nozzle port, the injection pipe projects toward the injection port of the nozzle port, and the injection pipe is moved from the piston by a predetermined amount. In other words, by adopting a configuration in which the main closing valve is opened when the liquefied gas filling nozzle is incompletely mounted when the liquefied gas charging nozzle is almost completely protruded, sufficient safety can be secured.

Further, by providing a contact member having a spherical portion at the tip end, even if the insertion direction of the gas filling nozzle is slightly shifted, the gas filling nozzle can be brought into close contact with the nozzle port, and leakage of the liquefied gas can be prevented. Further, by adopting this structure, the degree of freedom in the insertion direction of the liquefied gas filling nozzle can be increased.

[Brief description of the drawings]

FIG. 1 is a sectional view of a liquefied gas filling nozzle according to one embodiment of the present invention.

FIG. 2 is a front view of a liquefied gas filling facility according to one embodiment of the present invention.

FIG. 3 is a side view of the liquefied gas filling equipment.

FIG. 4 is a side view of a liquefied gas filling nozzle.

FIG. 5 is a plan view of the liquefied gas filling nozzle.

FIG. 6 is a plan view of a main part of the liquefied gas filling nozzle.

FIG. 7 is a main part plan view for explaining the operation of the liquefied gas filling nozzle.

FIG. 8 is a sectional view of the liquefied gas filling nozzle.

FIG. 9 is a cross-sectional view illustrating an operation of the liquefied gas filling nozzle.

FIG. 10 is a cross-sectional view illustrating an operation of the liquefied gas charging nozzle.

FIG. 11 is a side view of the liquefied gas filling nozzle and the on-off valve.

FIG. 12 is a partial cross-sectional view of a liquefied gas filling nozzle according to another embodiment of the present invention.

FIG. 13 is a sectional view of a conventional liquefied gas filling nozzle.

FIG. 14 is a bottom view of a conventional liquefied gas filling nozzle.

[Explanation of symbols]

 2 Liquefied gas cylinder 4 Open / close valve 6 Nozzle port 7 Liquefied gas filling nozzle 20 Nozzle body 22 Engagement arm 25 Engagement member 32 Piston part 33 First spring 34 Second spring 35 Patch 36 Injection pipe 38 Needle valve 45 Second Air signal passage 47 Inflow passage 48 Groove 50 Gas supply unit 51 Lock valve

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Claims (2)

(57) [Claims] 1. A liquefied gas filling nozzle which is connected to a liquefied gas supply unit having a lock valve and presses a tip portion of the container to be filled with a liquefied gas by pressing a tip end thereof into a nozzle port of the container. An engagement arm that engages with the engaged portion and draws the cylindrical nozzle body toward the nozzle receiving port side; and a piston portion that is protruded from the nozzle body so as to be able to retreat freely and is urged in a protruding direction by a pressing member; An abutting tool provided at the tip of the piston portion and closely contacting the nozzle receiving port, and is internally provided so as to be able to move back and forth through the abutting tool and the piston portion,
An injection pipe whose tip projects toward the injection port of the nozzle port when the nozzle body is pulled toward the nozzle port side. A liquefied gas filling nozzle comprising: a detecting unit for detecting the pressure and opening the main valve. 2. An abutment provided at a tip of a piston portion.
The liquefied gas filling nozzle according to claim 1 having a spherical portion .