JP2759424B2 - Liquefied gas filling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to, for example, L. P. G (liquefied propane gas); N. The present invention relates to a liquefied gas filling apparatus suitable for filling a liquefied gas such as G (liquefied natural gas) into a filling cylinder, and more particularly to a liquefier in which a filling valve is opened and closed by an external air pressure. The present invention relates to a gas filling device.

[0002]

2. Description of the Related Art A liquefied gas for supplying a liquefied gas as fuel to homes and businesses is disclosed in Japanese Patent Application No. 4-225241 filed on Jul. 31, 1992. A liquefied gas filling device for filling a filling cylinder with liquefied gas in a storage tank has been proposed.

A conventional liquefied gas filling apparatus of this type will be described with reference to FIGS.

First, FIG. 7 shows a liquefied gas filling cylinder.

In the drawing, reference numeral 1 denotes a cylinder for charging a liquefied gas called a siphon tube. The cylinder 1 includes a cylinder body 2 formed of a high-strength metallic material as a cylindrical closed container, and a cylinder body. The valve body 2 is roughly constituted by a filling valve body 3 and a take-out valve body (not shown) provided at a central portion on the upper end side of 2.

In order to fill the cylinder body 2 with the liquefied gas, the filling valve body 3 has a filling port 4 projecting radially and opening to the outside, and the filling port 4 is connected to the cylinder body 2. A valve body (not shown) as a valve movably disposed in the valve body 3 to open and close the inside;
A valve handle 6 connected to the valve body via a valve shaft 5 to open and close the valve body and having a recess 6A formed on the upper surface side.
Are provided. In addition, a cap 7 constituting a safety valve is attached to the back side of the filling port 4 on the valve body 3, and the recess 3 A is located above the cap 7.
Are formed.

Reference numeral 8 denotes a valve body 3 when the cylinder 1 falls down or the like.
And a protector for protecting the valve handle 6.
The protector 8 is formed as an annular ring having a diameter of, for example, about 25 to 30 cm by bending a metal pipe into a ring shape. The protector 8 is mounted on the upper end side of the cylinder body 2 via a support plate 9 curved in an arc shape, and surrounds the periphery of the valve body 3 together with the support plate 9 at a position higher than the valve handle 6 by a predetermined dimension. I have. An opening 9A is formed in the support plate 9 at a position corresponding to the filling port 4.

Next, FIGS. 8 to 16 show a liquefied gas filling apparatus.

In the figure, reference numeral 10 denotes a filling machine which constitutes a liquefied gas filling apparatus, and a plurality of the filling machines 10 are provided at a liquefied gas filling station (not shown) or the like, and when filling the liquefied gas, Is raised and lowered from above. The filling machine 10 includes a head casing 1 described below.
1. The liquefied gas is charged into the cylinder 1 carried into the filling station through the filling valve 44 and the like, which comprises the swing arm 38 and the filling valve 44.

Reference numeral 11 denotes a head casing which is disposed above the cylinder 1 so as to be movable up and down.
Is a large-diameter reduction gear case 11A and the reduction gear case 11A
And an upper head section 11B and a lower head section 11C, which are provided above and below, respectively.
And a lower cylindrical part 11D between the lower head part 11C.
Is provided. The lower head 11C of the head casing 11 is provided with a holder 11D as shown in FIG.
A valve opening / closing head 31 to be described later, which is engaged with the valve handle 6, is provided on the inner periphery on the lower end side of the lower head portion 11 </ b> C so as to be rotatable forward and backward.

Numeral 12 denotes a hanger integrally provided on the upper end side of the upper head portion 11B and constituting a part of the head casing 11. The hanger 12 has a substantially rectangular thick plate shape as shown in FIGS. A small-diameter portion 12A and a large-diameter portion 12B protrude upward and downward from the base end, and a substantially L-shaped support leg 12C protrudes downward from the distal end. . The hanger 12 has a large diameter portion 12B.
Are fixed on the upper head portion 11B via bolts 13, 13,..., And the entire head casing 11 is raised and lowered in a filling factory (not shown) via brackets 15, chains 17, etc. It is suspended as much as possible.

The hanger 12 has a small diameter portion 12A,
A rod insertion hole 12D is formed vertically between the large diameter portion 12B and the support leg portion 12C.
A rod 49A of an air cylinder 49 described later is inserted through 2D. On the other hand, a pair of spring supports 12E, 12E protrudes in the left and right direction at an intermediate portion of the support leg portion 12C, and each of the spring supports 12E supports a return spring 41 between a swing arm 38 described later. Has become. A slide plate 12F is provided on the inner surface on the distal end side of the support leg 12C,
As shown in FIG. 12, rollers 53 of a cam roller 50 described later are rotatably engaged with the slide plate 12F.

Reference numeral 14 denotes a mounting ring rotatably provided at the upper end of the small diameter portion 12A of the hanger 12, and 15, 15 a pair of brackets fastened to the upper surface of the mounting ring 14 by bolts 16, 16,. Each of the brackets 15 has both ends connected to chains 17, 17, and the head casing 1
Each chain 1 can be moved up and down in the filling factory
7 is suspended. The mounting ring 14 is formed of the entire head casing 11 including the hanger 12 and the bracket 1.
5 is allowed to rotate, and each chain 17 is prevented from being twisted during the charging operation of the liquefied gas.

Reference numeral 18 denotes the hanger 1 of the head casing 11.
2 shows an air motor provided on the reduction gear case 11A adjacent to the second gear 2 and the like. A small diameter gear 19 is fixed to an output shaft 18A of the air motor 18 as shown in FIG.
Reference numeral 9 meshes with the large-diameter gear 20 in the reduction gear case 11A of the head casing 11. The inner peripheral side of the large-diameter gear 20 is fixed to a stepped cylindrical sleeve 21, and the sleeve 21 is rotatably disposed in the holder 11 </ b> D of the head casing 11. A rotating shaft 22 is inserted into the sleeve 21 so as to be relatively rotatable, and the rotating shaft 22 is transmitted with a rotating torque from the sleeve 21 via a torque limiter 23 described later. A valve opening / closing head 31 is provided at the lower end side of the rotating shaft 22, and the valve opening / closing head 31 is moved by the air motor 18 to the torque limiter 23.
And the like.

Reference numeral 23 denotes a torque limiter provided in the lower head portion 11C of the head casing 11 for adjusting a rotational torque to be transmitted between the sleeve 21 and the rotating shaft 22. The torque limiter 23 is shown in FIG. As shown in the drawing, a rotating plate 25 which is stopped by the rotating shaft 22 via a key 24 and is provided on the rotating shaft 22 so as to be slidable in the axial direction,
And a friction plate 26 disposed between the lower end surface of the sleeve 21 and the lower end side of the sleeve 21 and in frictional contact with the rotating plate 25 and the sleeve 21.
An annular support plate 29 urged toward the rotating plate 25 by a disc spring 27 to engage the rotating plate 25 with the friction plate 26, and a thrust bearing 28 disposed between the rotating plate 25 and the annular supporting plate 29. Approximately.

Here, the torque limiter 23 is provided between the lower head 1 and the holder 11D of the head casing 11.
By changing the screwing position of 1C and adjusting the spring load of the disc spring 27, the rotational torque to be transmitted between the sleeve 21 and the rotary shaft 22 is variably set. The torque is transmitted to the rotation shaft 22. Then, for example, the valve handle 6 of the cylinder 1 is closed by the valve opening / closing head 31, and when an overload exceeding the set pressure of the disc spring 27 acts on the rotating shaft 22, the rotating plate 25 is applied to the sleeve 21 by the friction plate 26. It is configured to cause idle rotation through the sleeve 21 and release rotation transmission of a set torque or more between the sleeve 21 and the rotating shaft 22. 30
Is the holder 11D of the head casing 11 and the sleeve 2
1 shows another thrust bearing provided between the first and second thrust bearings.

Numeral 31 denotes a valve opening / closing head provided at the lower end of the rotating shaft 22 so as to be integrally rotatable. The valve opening / closing head 31 is stopped by the rotating shaft 22 via a key 24, and A sliding cylinder 32 slidably provided in the direction shown in FIG. 1 and a claw 33A on the distal end side fixed to the lower end of the sliding cylinder 32 for opening and closing the valve handle 6 of the cylinder 1.
33A are formed with cylindrical fingers 33 which engage with the outer peripheral side of the valve handle 6. Then, the valve opening / closing head 31 rotates forward and backward together with the rotating shaft 22 to open and close the valve handle 6 with each claw 33A of the finger 33.

Numeral 34 denotes a guide boss located on the inner peripheral side of the finger 33 and screwed to the lower end of the rotary shaft 22 as positioning means. The guide boss 34 is formed of a substantially cylindrical nut. When the head casing 11 or the like is lowered in the filling factory to fill the inside with the liquefied gas, the valve opening / closing head 31 is fitted into the recess 6A of the valve handle 6 as shown in FIG. Is aligned with the valve handle 6, and the engagement of the claw 33 </ b> A of the finger 33 with the outer peripheral side of the valve handle 6 is compensated. Here, the guide boss 34 is provided on the inner peripheral side of the lower end of the lower head portion 11C and a weak spring 35 described later.
When the entire head casing 11 is lowered in the filling factory and the valve opening / closing head 31 is engaged with the valve handle 6, the valve opening / closing head 31 is moved to the outer peripheral side of the valve handle 6. It is positioned reliably while guiding it to the recess 6A and the like.

The rotary plate 25 of the torque limiter 23 is located in the lower head portion 11C of the head casing 11.
And a weak spring disposed between the valve opening / closing head 31 and the sliding cylinder 32 of the valve opening / closing head 31. The weak spring 35 constantly biases the valve opening / closing head 31 downward with a relatively weak spring force. 31 is allowed to slide upward with respect to the rotating shaft 22, and the claw portion 33A of the finger 33 is
Is securely engaged with the concave / convex portion on the outer peripheral side of the valve handle 6.

Numeral 36 denotes a buffer spring disposed between the sleeve 21 and the rotary shaft 22 via a thrust bearing 36A or the like. The buffer spring 36 constantly controls the rotary shaft 22 with a larger spring force than the weak spring 35. The guide boss 34 is urged downward so that, for example, the entire head casing 11 is lowered.
Cushions a shock or the like when colliding with the concave portion 6A of the valve handle 6.

When the cushioning spring 36 bends and deforms, the rotating shaft 22 is rotated by the sleeve 21 and the torque limiter 23.
Relative to the valve opening / closing head 31
Are relatively displaced upward and downward in the lower head portion 11C. The buffer spring 36 is connected to the head casing 11.
The whole is allowed to be displaced up and down relative to the valve body 3 of the cylinder 1, and the filling nozzle 46 is adjusted while the height of the filling nozzle 46 described later is adjusted with respect to the filling opening 4 of the valve body 3. It is ensured that the body 3 is correctly fitted to the filling port 4.

Reference numeral 37 denotes a backup guide arm extending downward from the reduction gear case 11A of the head casing 11 along the lower head portion 11C. The guide arm 37 is located below the lower head portion 11C. A backing plate 3 protrudes with a predetermined length and has a lower end that can abut on the cap 7 of the valve body 3 with a gap from the back side.
7A is provided. The guide arm 37 supports the cylinder 1 from the back side of the valve body 3 via the valve body 3 when the back support plate 37A comes into contact with the cap 7, and the filling nozzle 46 is inserted into the filling port 4 of the valve body 3. The cylinder 1 is reliably prevented from tilting when the is strongly fitted.

Reference numeral 38 denotes a substantially L-shaped swing arm as a support arm extending downward on the radially outer side of the head casing 11, and the swing arm 38 has an upper end side (base end side) as shown in FIG. As shown, a pair of mounting portions 38A, 38A are provided left and right apart from each other, and each of the mounting portions 38A is swingably mounted on the hanger 12 of the head casing 11 via a pair of connecting pins 39, 39. I have. The lower end (tip end) of the swing arm 38 is connected to the arm head 38.
B becomes a free end, and the arm head 38B is moved around the connecting pin 39 together with the filling valve 44 described later with reference to FIG.
Swings in the directions of arrows A and B along the locus R shown in FIG.

As shown in FIG. 10, a pedestal 38C to which an operation valve 56 to be described later is fixed is provided at a middle portion in the longitudinal direction of the swing arm 38, and a pair of forks protruding from the pedestal 38C. Are formed integrally with each other, and each mounting portion 38A is integrally connected to the upper end side of each of the supporting arms 38D. Then, each mounting portion 38A of the swing arm 38
Between the support arms 38D and between the support arms 38D, support legs 12C of the hanger 12 and the like are arranged.
It is configured to allow swinging with respect to.

Further, each support arm 38 of the swing arm 38
D is provided with bosses 38E, 38E for attaching springs at positions facing the respective spring supports 12E of the hanger 12, and each boss 38E has a bolt 40 as shown in FIG.
Each return spring 41 is attached via such as. The respective return springs 41 are connected to the respective spring supports 12E of the hanger 12.
15, the swing arm 38 is constantly urged in the direction indicated by the arrow A, and before the liquefied gas is charged, the swing arm 38 is turned on.
It is arranged at the standby position shown in.

Reference numeral 42 denotes a joint attached to the side of the base 38C of the swing arm 38 as shown in FIG. 10. On the upper surface side of the joint 42, the joint 42 extends vertically and fills a liquefied gas storage tank with a filling control valve or the like. A pipe for charging liquefied gas (both not shown) connected through the joint is attached, and the joint 42 connects this pipe to L as shown in FIG.
Filling valve 4 via a gas pipe 43 bent in a V-shape.
4 is connected.

Reference numeral 44 denotes an arm head 38 of the swing arm 38.
FIG. 16 shows a filling valve for filling a liquefied gas provided at the tip of the valve B. The filling valve 44 is provided with a liquefied gas inlet 45A as shown in FIG.
A valve casing 45 having a valve chamber 45D formed between the valve casing 45C and the valve casing 45D.
And a cylindrical filling nozzle 46 which is slidably inserted into the valve guide 45B of the valve casing 45 and whose distal end projects from the valve guide 45B toward the filling port 4 of the cylinder 1. A valve shaft 46 protruding from the inside of the valve guide 45B toward the inside of the valve chamber 45D at the base end side of the filling nozzle 46.
A is integrally formed.

The valve shaft 46A of the filling nozzle 46 is provided with a valve body 4 which is detachably seated on a valve seat 45B1 of a valve guide 45B.
6B are provided integrally, and the valve body 46B is
6 and the valve guide 45B, and is normally urged in a valve closing direction by a valve spring 46C. As for the filling valve 44, the valve chamber 45D of the valve casing 45 is always in communication with the gas pipe 43 provided on the arm head 38B side via the liquefied gas introduction port 45A, and the valve body 46B is connected to the valve spring 46C as shown in FIG. When the valve is opened against
The liquefied gas from 5D is introduced into the filling nozzle 46 through the through hole 46D and filled into the cylinder body 2 through the filling port 4.

The filling nozzle 46 is positioned below the lower head portion 11C of the head casing 11 so that the tip end of the filling nozzle 46 is fitted into the filling port 4, and is parallel to each mounting portion 38A of the swing arm 38. It is growing. On the other hand, the valve casing 4
5 has a cylindrical nozzle guide 4 on the outer peripheral side of the valve guide 45B.
5E is provided, and the nozzle guide 45E is
6 surrounding the outer peripheral side. The nozzle guide 45E is formed in a cylindrical shape having an inner diameter slightly larger than the filling port 4 of the cylinder 1, and when the leading end side of the filling nozzle 46 is fitted into the filling port 4,
And the filling nozzle 46 is positioned with respect to the filling port 4.

Reference numerals 47, 47 designate the respective supporting arms 3 of the swing arm 38.
8D shows a pair of left and right cam plates provided on the inner surface side of the 8D so as to be separated to the left and right. Each of the cam plates 47 is formed in a substantially triangular shape as shown in FIGS. Are fixed to the inner surface of each of them via bolts 48 and the like. Each of the cam plates 47 has a guide surface 47A having a large inclination angle and a cam surface 47B having a gentle inclination angle formed on one side, and each roller 54 of a cam roller 50 described later is provided on the guide surface 47A as shown in FIG. When engaged, the swing arm 38 is held at the standby position by the return springs 41 and the rollers 54
When the is engaged with the cam surface 47B, the swing arm 38 is held in a state of being swung to the filling position shown in FIG.

Reference numeral 49 denotes an air cylinder provided on the upper surface side of the hanger 12, and the air cylinder 49 is attached to the hanger 12 adjacent to the small diameter portion 12A of the hanger 12 as shown in FIG. Rod 49A
Is inserted into the swing arm 38 through the rod insertion hole 12D of the hanger 12. The air cylinder 49 expands and contracts the rod 49A by supplying and discharging air from the outside via the operation valve 56, and operates the cam roller 50 toward the cam plate 47 side.

Reference numeral 50 denotes a cam roller provided on the tip end side of the rod 49A of the air cylinder 49. The cam roller 50 is, as shown in FIGS. A roller 51 is generally constituted by a central roller 53, 53 made of a ball bearing or the like provided rotatably via a pin 52 on the distal end side of the pin 51, and left and right rollers 54, 54. Here, the roller holder 51 of the cam roller 50 is screwed to the distal end side of the rod 49A via a nut 55, and is fixed in a loosened state. The left and right rollers 54, 54 are rotatably engaged with the guide surfaces 47A, 47B of the cam plates 47, and the center rollers 53 are supported by the support legs 12 of the hanger 12.
C is rotatably engaged with C via a slide plate 12F.

When the rod 49A of the air cylinder 49 extends as shown in FIG. 8, each roller 54 engages with the cam surface 47B of the cam plate 47 so that the swing arm 38 is filled with the filling valve. Locus R with 44
Along the arrow B in the direction of arrow B, and the filling nozzle 46 of the filling valve 44 is inserted into the filling port 4 of the cylinder 1 by the nozzle guide 45.
Fit through E. At this time, each roller 53 at the center of the cam roller 50 is connected to the slide plate 12F of the support leg 12C.
, The support leg 12C of the hanger 12
The swing arm 38 is swung in the direction indicated by the arrow B through the arrow to hold the filling nozzle 46 in a state fitted to the filling port 4. Further, when the rod 49A of the air cylinder 49 is contracted as shown in FIG. 15, each roller 54 is engaged with the guide surface 47A of each cam plate 47, so that the swing arm 38 is moved by each return spring 41 as indicated by an arrow A. Swinging in the direction
4 is held at the standby position separated from the filling port 4.

Reference numeral 56 denotes an operation valve provided on the pedestal portion 38C of the swing arm 38. As shown in FIG. 14, the operation valve 56 includes a cylindrical valve casing 57 fixedly provided on the pedestal portion 38C. The spool 58 is slidably inserted into the valve casing 57 and has both ends in the axial direction projecting out of the valve casing 57 to the outside. Knobs 59 and 60 are provided on both ends of the spool 58. . The valve casing 57 has an air supply port 57A connected to an air source such as an air pump via an air conduit (neither is shown), and air exhaust ports 57B and 57C. And the air exhaust ports 57B and 57C are provided with a spool 5
8 center land 58A and side lands 58B, 58
Opened and closed by C. Further, a return air supply port 57D is formed in the valve casing 57 on the right side in FIG. 14 of the side land 58C of the spool 58, and the return air supply port 57D is connected to the side land 58 of the spool 58.
By applying a pilot air pressure to C from the outside, the spool 58 is slid in the direction of arrow C.

Reference numerals 61 and 62 denote valve casings of the operation valve 56.
An air passage formed in a substantially L shape from 7 to the pedestal portion 38C. One end of each of the air passages 61 and 62 is opened in the valve casing 57, and the other end of each air supply / discharge of the air cylinder 49 is provided. Connection ports 61A and 62A are respectively connected to the ports via air conduits (neither is shown). The air passages 61 and 62 are connected to the spool 58 of the operation valve 56.
Is slidably displaced in the directions indicated by arrows C and D via knobs 59 and 60, and is selectively communicated with the air supply port 57A of the valve casing 57 so that air from the air source is supplied to the air cylinder 49. Supply through each air supply / discharge port. Reference numeral 63 denotes a substantially L-shaped handle integrally provided on the valve casing 57 of the operation valve 56.

Numeral 64 denotes a cam for checking the rotation of the valve provided at the protruding end of the rotating shaft 65 protruding from the upper end of the small diameter portion 12A of the hanger 12, and the cam 64 is provided with the hanger 12 and the head as shown in FIGS. The valve opening / closing head 3 is provided via rotary shafts 65 and 22 extending in the casing 11 in the axial direction.
1 and rotates integrally with the valve opening / closing head 31. A rotation sensor (not shown) is provided in the vicinity of the cam 64. The rotation sensor controls the rotation of the valve opening / closing head 31 when the valve opening / closing head 31 opens and closes the valve handle 6 of the cylinder 1. Detected via the cam 64, it is confirmed whether the valve handle 6 has been completely closed after filling with the liquefied gas, for example.

The liquefied gas filling apparatus according to the prior art has the above-described configuration, and its operation will be described below.

First, when the cylinder 1 to be filled with the liquefied gas is conveyed to the filling station by a conveying means such as a chain conveyor or a rotary table, it is lifted above the filling station via the bracket 15, each chain 17 and the like. The lowered head casing 11, the swing arm 38, and the like are lowered to the positions shown in FIG. At this time, the operator grasps the handle 63 and guides the arm head 38B, the filling valve 44, and the like to pass through the inside of the protector 8, while holding the lower end of the lower head portion 11C of the head casing 11 at the valve handle of the valve body 3. The guide boss 34 is detachably fitted into the recess 6A of the valve handle 6 as shown in FIG.
The finger 33 of the valve opening / closing head 31 is engaged with the outer peripheral side of the valve handle 6.

Next, the operator pushes the swing arm 38 along the locus R in FIG. 8 in the direction indicated by the arrow B so that the filling nozzle 46 is inserted into the filling port 4 of the cylinder 1. When the spool 58 of the operation valve 56 is pushed in the direction of arrow D in FIG. 14, air from the air source is supplied to the air cylinder 49 via the air supply port 57A of the operation valve 56, the air passage 61, and the like.
Of the air cylinder 49 (not shown), and extends so that the rod 49A of the air cylinder 49 projects downward. Then, when the rod 49A is extended as shown in FIG. 8, the cam rollers 50 provided on the tip side of the rod 49A of the air cylinder 49 are swung by the engagement of the rollers 54 with the cam surface 47B of the cam plate 47. The arm 38 is further swung in the direction of arrow B along the trajectory R along with the filling valve 44, and the filling nozzle 46 of the filling valve 44 is fitted to the filling port 4 of the cylinder 1 via the nozzle guide 45E.

At this time, each roller 53 at the center of the cam roller 50 engages with the slide plate 12F of the support leg 12C, so that the swing arm 38 moves in the direction of arrow B through the support leg 12C of the hanger 12. The swinging motion is compensated, and the filling nozzle 46 is held in a state fitted to the filling port 4. As a result, the filling nozzle 46 is firmly fitted into the filling port 4 via the nozzle guide 45E, and is pushed in the direction of arrow E shown in FIG. The body 46B is opened against the valve spring 46C so that the liquefied gas can be filled.

In this state, when a filling start signal is output from a controller (not shown) or the like and the air motor 18 is rotated, the rotation is caused by the rotation of the gears 19 and 20 shown in FIG.
The signal is transmitted to the valve opening / closing head 31 via the sleeve 21, the torque limiter 23, the rotating shaft 22, and the like, and the valve handle 6 is rotated in the forward direction by the finger 33, so that the valve body in the valve body 3 is opened. The liquefied gas can be filled into the cylinder 1 from an external storage tank via the filling control valve, the joint 42, the filling nozzle 46 and the like.

Next, when the liquefied gas is fixedly filled in the cylinder 1 and a filling completion signal is output from the controller, the air motor 18 rotates in the reverse direction, and the valve handle 6 is closed via the valve opening / closing head 31. By rotating in the valve direction and detecting the rotation angle (number of rotations) at this time via the cam 64 with the rotation sensor, it is possible to confirm whether or not the valve body in the valve body 3 has been completely closed.

Further, the pilot air pressure is returned to the operation valve 56 from the outside based on the filling completion signal, and the air supply port 5
The air pressure is automatically supplied for a predetermined time via 7D, and this air pressure acts on the side land 58C of the spool 58 in the direction of arrow C in FIG. As a result, the spool 58 of the operation valve 56 is pushed in the direction of arrow C by this air pressure, so that the air supply port 57A of the operation valve 56 opens between the lands 58A and 58C of the spool 58, and Air is supplied into the rod-side air chamber (not shown) of the air cylinder 49 via the air supply port 57A, the air passage 62, and the like.

Thus, the rod 4 of the air cylinder 49
9A is reduced as shown in FIG. 15, and each roller 54 of the cam roller 50 comes into engagement with the guide surface 47A of each cam plate 47. Therefore, the swing arm 38 is swung in the direction of arrow A by each return spring 41. As a result, the entire swing arm 38 is radially separated from the head casing 11 as shown in FIG. 15, and the filling nozzle 46 of the filling valve 44 is detached from the filling port 4.

As a result, the valve body 46B of the filling nozzle 46 is pushed by the valve spring 46C in the direction indicated by the arrow F in FIG. 16, thereby seating on the valve seat 45B1 of the valve guide 45B and closing the filling valve 44. Hold in valve state. In this state, the swing arm 38 is automatically lifted by a balance weight (not shown) via the bracket 15 and the respective chains 17 together with the head casing 11 and the like, and at the ascending position, it becomes next. It waits for the cylinder 1 to be transported.

[0046]

In the prior art described above, the filling valve 44 provided at the lower end of the swing arm 38 is connected to a valve casing 45 comprising a valve guide 45B and a lid 45C, and a valve casing 45. Valve guide 45
B and a cylindrical filling nozzle 46 slidably inserted into the inner end B and projecting from the valve guide 45B toward the filling port 4 side of the cylinder 1. A valve shaft 46A projecting from the valve guide 45B into the valve chamber 45D is integrally formed on the base end), and the valve shaft 46A is provided with a valve body 46B which is detachably seated on a valve seat 45B1 of the valve guide 45B. Since the valve body 46B is provided integrally and is always urged in the valve closing direction by the valve spring 46C on the back side of the filling nozzle 46, the following problem occurs.

That is, when the liquefied gas is filled, the filling nozzle 46 is fitted into the filling port 4 of the cylinder 1,
6 is pushed in the direction of arrow E shown in FIG. 16 to open the valve body 46B against the valve spring 46C and into the cylinder 1 via the filling nozzle 46 and the filling port 4. Fill with liquefied gas. After the filling is completed, the filling nozzle 46 is separated from the filling port 4, and at this time, the valve body 46B of the filling nozzle 46 is pushed in the direction of arrow F in FIG. 46B to valve guide 45B
The filling valve 44 is kept closed by seating on the valve seat 45B1.

For this reason, in the prior art, the filling nozzle 46
After the valve body 46B is released from the filling port 4, a response delay is likely to occur until the valve body 46B is pushed by the valve spring 46C to close the valve, and the response delay time until the valve body 46B is completely closed. There is a problem that the liquefied gas filled in the valve chamber 45D of the filling valve 44, the liquefied gas introduction port 45A, the gas pipe 43 and the like leaks from the tip side of the filling nozzle 46 to the outside.

Further, since the valve body 46B is provided on the back side of the filling nozzle 46, even after the valve body 46B is closed, for example, about 5.2 cc of gas remains in the filling nozzle 46. When the filling nozzle 46 is separated from the filling port 4 of the cylinder 1, the residual gas leaks from the tip side of the filling nozzle 46 to the outside. In general, the number of cylinders 1 to be processed in a filling factory is 10 per day.
Since the number is from 00 to 2,000, the cost is 5.
If about 2 cc of gas leaks, more than 5 to 10 liters of gas will be wastefully discharged into the filling factory, which will not only improve productivity but also worsen the working environment if the amount of leaking gas increases. As a result, there is a problem that safety in the filling factory cannot be secured.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention enables the filling valve to be opened and closed with high responsiveness at the time of filling and completion of the liquefied gas. It is an object of the present invention to provide a liquefied gas filling apparatus capable of surely reducing the amount of gas leaking from the liquefied gas and significantly improving the productivity and safety of the liquefied gas filling operation.

[0051]

In order to solve the above-mentioned problems, the present invention provides a filling valve provided with a filling nozzle on one side, and a liquefied gas provided on the other side of the filling valve. The present invention is applied to a liquefied gas filling apparatus including valve moving means for moving a filling valve toward the filling port so as to be detachably fitted to the filling port of the filling cylinder.

The first aspect of the present invention is characterized in that the filling valve has a valve cylinder sliding hole ,
A valve casing in which a liquefied gas inlet, an air inlet and an air outlet are formed axially separated from the valve cylinder sliding hole,
At least a base end side is slidably provided in a valve sleeve sliding hole of the valve casing, and a distal end side is a filling nozzle which is a filling nozzle fitted into the filling port portion. A spring disposed between the valve casing and constantly biasing the valve cylinder in a direction in which the filling nozzle protrudes from the valve casing; and a rod-shaped valve body extending in the valve cylinder in the axial direction . Is displaced in the axial direction.
A valve portion provided with a plunger that opens and closes a filling nozzle of the valve cylinder. The plunger is supplied and exhausted with air pressure through an air inlet and an air outlet of the valve casing. The filling nozzle is opened and closed by sliding displacement inside the valve cylinder in the axial direction, and the liquefied gas from the liquefied gas introduction port is filled into the cylinder via the filling nozzle.

In this case, as in the invention described in claim 2,
At the proximal end of the plunger, a rod-side
The piston that defines the air chamber and the bottom air chamber is
The air chambers are connected to the air inlet of the valve casing and the air.
By supplying and discharging air pressure through the discharge port,
Preferably , the plunger is driven to open and close in the axial direction .

According to a third aspect of the present invention , between the valve casing and the valve cylinder, a rod side in the valve cylinder is provided.
Introduce air into the valve casing through the air chamber and the bottom side air chamber
Switching passage for selectively connecting to the port and air discharge port
Means, and the switching passage means is always in the rod side
A chamber is connected to the air discharge port and the bottom side air chamber is connected.
Is connected to the air inlet, and an external force acts on the filling nozzle.
When the valve cylinder slides and displaces in the valve casing,
Connect the rod side air chamber to the air introduction port and
It is preferable that the bottom side air chamber is connected to the air outlet .

Further, a feature of the structure adopted by the invention according to claim 4 is that the filling valve has a valve cylinder sliding hole ,
A valve casing in which a liquefied gas inlet, an air inlet and an air outlet are formed axially separated from the valve cylinder sliding hole,
At least the base end side is slidably provided in the valve cylinder sliding bore of the valve casing, extends a valve cylinder having a filling nozzle tip end is fitted in the filling opening, the valve in the cylinder in the axial direction is formed as a valve body of the rod-shaped, the valve in the by axial displacement of the cylinder, a fill nozzle of the distal valve unit valve cylinder opens, and closes the plunger rod side air chamber within the valve cylinder And a bottom side air chamber are provided at the base end side of the plunger, and external air pressure is supplied to and discharged from each of the air chambers through an air inlet and an air outlet of the valve casing. Accordingly, a piston for driving the plunger in the axial direction is provided between the valve casing and the valve cylinder, and the rod-side air chamber and the bottom-side air chamber in the valve cylinder are connected to the air introduction of the valve casing. Disconnection for selectively switching connection to port and air discharge port And passage means, said valve casing and the valve
The filling nozzle is always located between the cylinder and the valve case.
Biasing the valve cylinder in a direction to protrude from the switching passage.
Means is connected to the rod side air chamber through an air outlet.
And connect the bottom side air chamber to the air inlet.
When an external force acts on the filling nozzle,
To allow the valve cylinder to slide and displace in the valve casing.
Then, the rod side air chamber is energized through the switching passage means.
A and connect the bottom side air chamber to the
And a spring connected to the air discharge port .

Further, as in the invention according to claim 5, an urging means for urging the plunger in a valve closing direction via a piston is provided in the bottom side air chamber, and air is introduced into the valve casing. A directional switching valve may be provided in the middle of the air pipe connecting the port to the air source, for selectively switching the air introduction port between the air source and the atmosphere by an external signal.

On the other hand, as in the sixth aspect of the present invention,
The liquefied gas introduction port communicates with the inside of the valve cylinder and is blocked.
An auxiliary valve element for disconnecting the auxiliary valve element.
It is constantly urged in the valve closing direction, and an external force is applied to the filling nozzle.
Acts when the valve cylinder slides and displaces in the valve casing
It may be configured you open to.

[0058] The feature of the configuration employing the invention described in claim 7, wherein the filling bubble has a valve cylinder slide hole, the liquefied gas introduced axially spaced of the valve cylinder sliding hole A valve casing having a port and a pair of air supply / discharge ports formed therein, and a filling nozzle having at least a base end side slidably provided in a valve cylinder sliding hole of the valve casing and a leading end side fitted into the filling port portion. The liquefied gas introduction port is provided in the valve cylinder so as to communicate with and shut off the liquefied gas introduction port from the inside of the valve cylinder, and is normally kept closed by a spring, and an external force acts on the filling nozzle. The valve body is formed as an auxiliary valve body that opens when the sliding position changes, and a rod-shaped valve body that extends in the valve cylinder in the axial direction, and is displaced in the valve cylinder in the axial direction. Yo
A plunger for opening and closing a filling nozzle of the valve cylinder at a distal end side; and a rod-side air chamber provided on a base end side of the plunger and individually communicating with the pair of air supply / discharge ports. A piston that defines a bottom-side air chamber in the valve cylinder, and is provided in the middle of an air pipe connecting each of the air supply and discharge ports to an air source, and each of the air supply and discharge ports is connected to an air source by an external signal. A direction switching valve for selectively switching connection to the atmosphere, the direction switching valve opens the plunger by supplying air pressure from an air source to the rod-side air chamber at one switching position, At the other switching position, the plunger is closed by supplying the air pressure to the bottom air chamber.

Furthermore, a head casing is disposed above the liquefied gas filling cylinder so as to be able to move up and down, and a valve of the cylinder is opened and closed in the head casing. Preferably, a valve opening / closing head is provided, and the filling valve is movably provided via the valve moving means.

[0060]

SUMMARY OF] According to the invention described in claim 1, the filling valve
A liquefied gas inlet, an air inlet, and an air outlet are formed in the valve casing, and the valve casing is slidable on the valve casing whose tip side is a filling nozzle fitted to the filling port of the cylinder.
The plunger can be displaced relative to the valve cylinder.
The provided open filling nozzle of the valve cylinder at the distal end of the plunger, because was configuration that closes, filling of liquefied gas, the air pressure through an air inlet and an air outlet of the valve casing upon completion by supplying and discharging opening the filling nozzle by displacement of the axial direction of the plunger in the valve cylinder, can closed, wherein the liquefied gas from a liquefied gas inlet through the filling nozzle volume <br/> Nbe Can be filled inside. The plunger can be quickly opened and closed by supplying and discharging air pressure from the outside, and the responsiveness at the time of opening and closing can be improved. Further, the plunger is a Filling nozzle at the tip end of the valve cylinder opens, because that closes the gas remaining in the valve cylinder at the time of closing of the plunger can be reduced significantly from leaking to the outside.

In this case, as in the second aspect of the present invention,
At the base end of the plunger, a rod-side air chamber is provided in the valve cylinder.
A piston that defines the bottom side air chamber is provided integrally.
The air inlet of the valve casing and the air
When air pressure is supplied to and exhausted from each air chamber through the exhaust port,
Drive the plunger in the axial direction to move the filling nozzle
In the open, it can be closed.

According to a third aspect of the present invention, a valve
Switching passage means is provided between the
The rod side air chamber and the bottom side air chamber are
Selective connection for air inlet and air outlet
With this configuration, the rod side air chamber is always
And connect the bottom side air chamber to the air introduction port.
With this, the plunger is pierced by the air pressure in the bottom side air chamber.
Can be pressed in the valve closing direction via the ton
Can be closed with. Then, when filling the liquefied gas,
If the tip side of the filling nozzle is fitted to the filling port of the cylinder,
External force acts on the filling nozzle to slide the valve cylinder in the valve casing
Air can be introduced into the rod side air chamber
Air pressure can be introduced from the mouth. As a result, the rod side air
The plunger is moved in the valve opening direction via the piston by the air pressure of the chamber.
You can push, can Rukoto was automatically opening the filling valve.

Further, according to the fourth aspect of the present invention ,
Like the invention of claims 1 to 3, when filling the liquefied gas
If the tip side of the filling nozzle is fitted to the filling port of the cylinder,
The valve cylinder is placed inside the valve casing by the external force acting on the filling nozzle.
The air slides from the air inlet to the rod side air chamber.
Pressure can be introduced, so plan with the air pressure in the rod side air chamber
Can be pushed in the valve opening direction via a piston,
The valve can be automatically opened. And filling is completed
At the end of the process, the tip of the filling nozzle is removed from the filling port of the cylinder.
If the valve cylinder protrudes from the valve casing
Since pushed back by a spring in direction, the rod-side air chamber is connected to the air outlet, bottom-side air chamber by Rukoto connected to e <br/> A inlet, an air pressure of the bottom side air chamber The plunger can be pressed in the valve closing direction via the piston, and the filling nozzle can be closed on the tip side.

Further, in the invention according to claim 5 ,
An urging means for urging the plunger in a valve closing direction via a piston is provided in the bottom side air chamber, and an external signal is provided in the middle of an air pipe connecting an air inlet of the valve casing to an air source. A directional switching valve for selectively switching the air inlet between an air source and the atmosphere is provided .
After the filling is completed, the direction switching valve is switched to the atmospheric pressure state of the rod side air chamber so that the plunger can be urged in the valve closing direction by the urging means, and before the filling nozzle is detached from the filling port of the cylinder. Can be closed.

[0065] On the other hand, as the invention described in claim 6, Benke
Liquefied gas introduction port is communicated with the inside of the valve cylinder and shut off
The auxiliary valve element is provided in the valve cylinder.
When filling with liquefied gas, the tip side of the filling nozzle is
Until the external force acts on the filling nozzle
Can close the auxiliary valve body and leak liquefied gas.
Can be reliably prevented. And external force acts on the filling nozzle
When the valve cylinder slides in the valve casing, the auxiliary valve
By opening the body, filling work is possible
Can be set and filled by the auxiliary valve element and plunger (valve element).
Open Hama valve, can it to set the valve closing operation in two stages.

Further, according to the present invention, the filling is performed.
A pair of air supply and exhaust ports are formed in the valve casing of the valve,
In the middle of the air line connecting each air supply / discharge port to the air source,
Each air supply / exhaust port is selected between air source and atmosphere by external signal
To provide a directional switching valve for switching connection
When the directional control valve is switched to one of the switching positions,
Supply air pressure from the air source to the rod side air chamber
The lancer can be opened and the filling nozzle can be
The valve can be opened promptly by switching. Also, directional switching valve
When the air pressure is switched to the other
The plunger closes quickly by supplying to the side air chamber.
Can be valved. And even in this case, when an external force acts on the filling nozzle and the valve cylinder slides and displaces in the valve casing, the auxiliary valve body is opened, so that the filling operation can be set to a possible state, and the auxiliary valve body can be set. The opening and closing operations of the filling valve can be set in two stages by the plunger (valve element).

Further, according to the present invention, a head casing is disposed above the liquefied gas filling cylinder so as to be movable up and down, and the valve of the cylinder is opened and closed to open and close the cylinder. in particular provision of the head
More, automatically open the tank valve in the valve closing head, Ru can closed. And, provided in the head casing
Use the valve moving means to move the filling valve to the filling port of the cylinder.
By moving, the filling valve can be automatically opened and closed in conjunction with the opening and closing of the valve.

[0068]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquefied gas filling apparatus according to an embodiment of the present invention will be described below with reference to FIGS. In the embodiment, the same components as those in the prior art shown in FIGS. 7 to 15 are denoted by the same reference numerals, and description thereof will be omitted.

FIGS. 1 and 2 show a first embodiment of the present invention.

In the figure, reference numeral 71 denotes a filling valve for filling the liquefied gas provided at the tip of the arm head 38B of the swing arm 38. The filling valve 71 is a valve casing 72 to be described later.
It comprises a valve cylinder 75, a plunger 80 and the like.

Reference numeral 72 denotes a valve casing constituting the main body of the filling valve 71. The valve casing 72 has a cylindrical portion 72.
A and an attachment portion 72B, and the upper end side of the attachment portion 72B is fixed to the tip (lower end) side of the arm head 38B of the swing arm 38. In the cylindrical portion 72A of the valve casing 72, a valve cylinder sliding hole 72C extending in the axial direction is formed, and the liquefied gas introduction port 72D is separated from the valve cylinder sliding hole 72C in the axial direction. An air inlet 72E and a pair of air outlets 72F and 72G are formed.
The 2D and air inlet 72E extend toward the mounting portion 72B.

The liquefied gas inlet 72D is connected to the gas pipe 43 on the side of the mounting portion 72B, and the air inlet 7
2E is connected to an air pipe (not shown). Also,
A valve cylinder sliding hole 72 is provided in the cylindrical portion 72A of the valve casing 72.
An annular valve seat portion 72H is formed between C and the liquefied gas introduction port 72D, and an auxiliary valve body 82 described later is configured to separate from and seat on the valve seat portion 72H. Further, a breathing hole 72J communicating with the inside of the valve cylinder sliding hole 72C is formed in the distal end side of the cylindrical portion 72A in the radial direction.

73 is inserted into the proximal end of the cylindrical portion 72A,
A cylindrical sleeve 72 is positioned in the cylindrical portion 72A by a retaining ring 74. The sleeve 73 has three annular grooves 73A, 73B, 73C that are axially separated and open to the outer peripheral side.
And three radial holes 73D, 73E, 73F extending radially inward from the annular grooves 73A, 73B, 73C. The annular groove 73 of the sleeve 73
A, 73C are always in communication with the air outlets 72F, 72G,
The annular groove 73B is always in communication with the air inlet 72E.
The sleeve 73 forms a part of the valve casing 72, and its inner peripheral surface forms a part of the valve cylinder sliding hole 72C.

Reference numeral 75 denotes a valve cylinder sliding hole 72 of a valve casing 72.
C shows a valve cylinder slidably inserted in C.
Is a stepped cylindrical filling nozzle 76 having a distal end protruding from the cylindrical portion 72A of the valve casing 72 and a proximal end inserted into the valve cylinder sliding hole 72C, and a screw thread at the proximal end of the filling nozzle 76. And a stepped cylindrical sliding cylinder 77 slidably inserted into the sleeve 73, and a base end of the sliding cylinder 77 is closed by a lid 78. In addition, a switching passage 77 communicating with air chambers G and H described later is provided in the sliding cylinder 77.
A and 77B are formed, and the switching passages 77A and 77B together with the annular grooves 73A, 73B and 73C of the sleeve 73 and the radial holes 73D, 73E and 73F constitute switching passage means.

When the filling nozzle 76 is fitted in the filling port 4 of the cylinder 1 as shown in FIG. 1, the valve cylinder 75 is moved by the reaction force from the filling port 4 to the auxiliary valve body 82 to be described later. By being pushed in the direction of arrow E against the spring 83, the switching passage 77A of the sliding cylinder 77 is connected to the air inlet 72E via the radial hole 73E and the annular groove 73B,
An air pressure is introduced into the air chamber H to bring the air chamber H into a high pressure state, and the switching passage 77B has the radial hole 73F and the annular groove 73.
By being connected to the air discharge port 72G via C,
The inside of the air chamber G is set to a low pressure (atmospheric pressure) state.

On the other hand, in a state where the filling nozzle 76 is separated from the filling port 4 of the cylinder 1 as shown in FIG.
Is pressed in the direction of arrow F by the spring 83, whereby the switching passage 77A of the sliding cylinder 77 is connected to the air discharge port 72F via the radial hole 73D and the annular groove 73A,
The air chamber H is set to a low pressure (atmospheric pressure) state, and the switching passage 77B is connected to the air introduction port 72E through the radial hole 73E and the annular groove 73B, thereby introducing air pressure into the air chamber G, and The chamber G is brought into a high pressure state.

The inner peripheral side of the filling nozzle 76 is a stepped plunger insertion hole 76A whose diameter is gradually reduced from the base end to the distal end, and an annular valve is provided at the distal end of the plunger insertion hole 76A. A seat 76B is formed. further,
An annular recess 76C is formed at a position adjacent to the auxiliary valve body 82 on the base end side outer periphery of the filling nozzle 76, and the annular recess 76C
Is always in communication with the plunger insertion hole 76A via the radial hole 76D. Further, a cylindrical seal 79 is mounted on the outer periphery of the tip side of the filling nozzle 76, and the cylindrical seal 79 is provided.
As shown in FIG. 1, when the filling nozzle 76 is fitted to the filling port 4 of the cylinder 1, the impact of the filling nozzle 76 is reduced, and the space between the filling nozzle 76 and the filling port 4 is sealed. .

Numeral 80 denotes a plunger as a valve body whose base end side is slidably inserted into the sliding cylinder 77 of the valve cylinder 75 and whose distal end side extends in the plunger insertion hole 76A of the filling nozzle 76 in the axial direction. The plunger 80 is formed in the shape of a stepped rod.
And a shaft portion 80B whose tip projects out of the filling nozzle 76 are integrally provided. Also,
At the base end of the plunger 80, a large-diameter piston 81 that slides and displaces inside the sliding cylinder 77 is provided integrally.
Reference numeral 1 defines a bottom-side air chamber G and a rod-side air chamber H in the sliding cylinder 77. The air chambers G and H are supplied and discharged with air pressure through the air inlet 72E and the air outlets 72F and 72G, so that the piston 81 is moved in the sliding cylinder 77.
Is displaced, and the plunger 80 is moved in the axial direction (arrows E1,
F1 direction).

As a result, when air pressure is supplied into the air chamber G, as shown in FIG. 2, the piston 81 and the plunger 80 slide and displace in the direction of arrow F1.
Of the filling nozzle 76 is seated on the valve seat 76B.
Is closed on the distal side. When air pressure is supplied into the air chamber H, as shown in FIG. 1, the piston 81 and the plunger 80 slide and displace in the direction of arrow E1, and the valve portion 80A of the plunger 80 separates from the valve seat portion 76B. Sit and open the filling nozzle 76 on the tip side.

Further, 82 is between the valve casing 72
Position to the auxiliary valve body provided in the valve sleeve 7 5, together with the auxiliary valve body 82 is formed in a ring shape by an elastic resin material or the like, and is fitted to the base end side outer circumference of the filling nozzle 76, the filling A backup ring 82 is provided between the nozzle 76 and the sliding cylinder 77.
Positioned via A. A spring 83 is provided between the backup ring 82A and the sleeve 73.
And the spring 83 connects the valve cylinder 75 to the auxiliary valve body 8.
2 and is always urged in the direction of arrow F. The auxiliary valve element 82 is configured to be separated from and seated on the valve seat 72H of the valve casing 72 to communicate and shut off the liquefied gas introduction port 72D with the inside of the filling nozzle 76. Where the spring
Reference numeral 83 denotes a valve socket as shown in FIG.
The valve sleeve 7 projects from the cylindrical portion 72A of the casing 72.
5 is urged in the direction of arrow F, the rod-side air chamber H is
The switching passage 77A, the radial hole 73D and the annular groove 73A
Connected to the air discharge port 72F via the
The air chamber G is connected to the switching passage 77B, the radial hole 73E and the annular shape.
It is connected to the air inlet 72E via the groove 73B. Ma
In addition, as shown in FIG.
When an external force acts on the valve body 75,
Is displaced in the direction indicated by the arrow E in the valve casing 72.
By allowing, the rod-side air chamber H is connected to the switching passage 77A,
Air inlet through radial hole 73E and annular groove 73B
72E and switch the bottom side air chamber G
Via path 77B, radial hole 73F and annular groove 73C
It is connected to the air discharge port 72G.

The filling valve 71 according to the present embodiment, like the filling valve 44 of the prior art, has the lower end of the head casing 11 shown in FIG. It is located below the side head portion 11C and extends in parallel with each mounting portion 38A of the swing arm 38.

The liquefied gas filling apparatus according to the present embodiment has the above-described configuration, and its basic operation is not particularly different from that of the prior art.

The operation of the filling valve 71, which is a feature of this embodiment, will be described.

First, when the filling nozzle 76 of the filling valve 71 is fitted to the filling port 4 of the cylinder 1 in order to fill the cylinder 1 with the liquefied gas, the tip side of the filling nozzle 76 is filled as shown in FIG. By being pressed into the mouth 4, the filling nozzle 76 and the sliding cylinder 77
Arrow E in the valve casing 72 against the spring 83 of FIG.
, The switching passage 77A of the sliding cylinder 77 is connected to the air inlet 72E via the radial hole 73E and the annular groove 73B, and the switching passage 77B is connected via the radial hole 73F and the annular groove 73C. It is connected to the air outlet 72G.

As a result, the air chamber H is brought into a high pressure state by the air pressure from the air inlet 72E, and the inside of the air chamber G is brought into a low pressure (atmospheric pressure) state. (In the valve opening direction) and the valve section 80
A is separated from the valve seat 76B. Further, at this time, the auxiliary valve element 82 is separated from the valve seat portion 72H of the valve casing 72, and the liquefied gas introduction port 72D communicates with the plunger insertion hole 76A through the annular concave portion 76C of the filling nozzle 76 and the radial hole 76D. Liquefied gas inlet 72
The liquefied gas from D can be filled into the cylinder 1 from the tip side of the filling nozzle 76 through the filling port 4.

Next, when the liquefied gas is fixedly filled in the cylinder 1 and a filling completion signal is output from a controller (not shown), the swing arm 38 moves in the direction of arrow A as illustrated in FIG. Since the entire swing arm 38 is radially separated from the head casing 11 by being swung, the filling valve 71
Is separated from the filling port 4 of the cylinder 1 and the filling nozzle 76 is detached from the filling port 4 as shown in FIG. Then, at this time, when the tip side of the filling nozzle 76 begins to separate from the filling port 4, the filling nozzle 76 and the sliding cylinder 77 are pushed by the spring 83 in the direction indicated by the arrow F to switch the sliding cylinder 77. The passage 77A is connected to the air outlet 72F via the radial hole 73D and the annular groove 73A, and the switching passage 77B is connected to the air inlet 72E via the radial hole 73E and the annular groove 73B.

As a result, the air chamber G is brought into a high pressure state by the air pressure from the air introduction port 72E, and the inside of the air chamber H is brought into a low pressure (atmospheric pressure) state. (The valve closing direction) and the valve section 80
A is seated on the valve seat portion 76B. Further, at this time, the auxiliary valve element 82 is pressed by the spring 83 to be seated on the valve seat 72H of the valve casing 72, thereby blocking the liquefied gas introduction port 72D from the annular concave portion 76C of the filling nozzle 76 and the like. Thus, the liquefied gas that is filled (residual) on the side of the liquefied gas introduction port 72 </ b> D can be blocked twice (two steps) by the auxiliary valve body 82 and the valve portion 80 </ b> A of the plunger 80.

Thus, according to the present embodiment, the filling valve 71 provided at the lower end of the swing arm 38 is connected to the liquefied gas inlet 72D, the air inlet 72E, and the air outlet 72F,
Valve casing 72 having 72G and including sleeve 73
A valve cylinder 75 slidably inserted into a valve cylinder sliding hole 72C of the valve casing 72, the distal side being a cylindrical filling nozzle 76 and the proximal side being a sliding cylinder 77; The plunger 80 which is slidably inserted into the inside 75 and has a distal end side serving as a valve portion 80A and is detachably seated on a valve seat portion 76B of the filling nozzle 76.
The sliding cylinder 7 is provided at the base end side of the plunger 80.
7 is provided with a piston 81 which defines a bottom-side air chamber G and a rod-side air chamber H, and selectively supplies external air pressure into the air chambers G and H according to the displacement of the sliding cylinder 77. The following operation and effect can be obtained because it is excluded.

That is, when the liquefied gas is filled, the filling nozzle 76 is fitted to the filling port 4 of the cylinder 1 and the filling nozzle 7
6 is pushed in the direction of arrow E together with the sliding cylinder 77, the air pressure from the air inlet 72E is introduced into the air chamber H, and the plunger 80 can be driven in the direction of arrow E1 (valve opening direction). The valve portion 80A can be separated from the valve seat portion 76B, and the filling nozzle 76 can be quickly opened on the distal end side.

When the filling of the liquefied gas is completed and a filling completion signal is output, when the leading end side of the filling nozzle 76 begins to separate from the filling port 4, the filling nozzle 76 and the sliding cylinder 77 are moved by the spring 83. As a result, the switching passage 77A of the sliding cylinder 77 is connected to the air outlet 72F, and the switching passage 77B is connected to the air inlet 72E. The plunger 80 can be immediately driven in the direction of arrow F1 by setting the high pressure state with the air pressure from 72E and the low pressure state in the air chamber H.
The valve portion 80A of the plunger 80 is seated on the valve seat portion 76B, and the filling nozzle 76 can be reliably closed at the distal end.

Therefore, in this embodiment, when the filling nozzle 76 is detached from the filling port 4 when the filling of the liquefied gas is completed,
By switching the supply / discharge direction of air pressure, the plunger 8
The zero valve section 80A can be immediately closed, and the responsiveness at the time of closing the valve can be greatly improved. Further, since the valve portion 80A of the plunger 80 closes the filling nozzle 76 on the tip side of the filling nozzle 76, it is possible to reliably prevent the residual gas remaining in the filling nozzle 76 from leaking to the outside. The amount of gas leaking to the vehicle can be effectively reduced.

When the filling nozzle 76 is detached from the filling port 4, the auxiliary valve element 82 is pressed by a spring 83 to be seated on the valve seat 72H of the valve casing 72, and the liquefied gas introduction port 72D is placed in the filling nozzle 76. Annular recess 76C
Therefore, the liquefied gas filled (remaining) on the side of the liquefied gas inlet 72D can be shut off in two steps (two stages) by the auxiliary valve element 82 and the valve portion 80A of the plunger 80. Various effects are exhibited, such as the productivity and safety of the gas filling operation can be greatly improved.

Next, FIG. 3 shows a second embodiment of the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. I do. However, a feature of the present embodiment is that an urging spring 91 as urging means is disposed between the lid 78 and the piston 81 and located in the bottom side air chamber G of the sliding cylinder 77. The plunger 80 is always urged in the direction of arrow F1 (valve closing direction) by the urging spring 91, and the air introduction port 72E of the valve casing 72 is provided.
Is provided with a direction switching valve 94 in the middle of an air pipe 93 connected to an air pump 92 as an air source.

The directional control valve 94 is constituted by a 3-port 2-position pneumatic directional control valve having a pair of pilot parts 94A and 94B.
By supplying the pilot air pressure as the 4B external signal, the switching to the switching positions (a) and (b) is controlled in accordance with the pilot air pressure. The direction switching valve 94 supplies the air pressure from the air pump 92 toward the air inlet 72E at the switching position (a), and opens the air inlet 72E to the atmosphere when the switching is performed to the switching position (b). Then, the biasing spring 91 pushes the plunger 80 in the valve closing direction.

Thus, in this embodiment having the above-described structure, substantially the same operation and effect as those of the first embodiment can be obtained. However, in this embodiment, particularly, when the filling of the liquefied gas is completed, the controller ( (Not shown), the direction switching valve 94 is temporarily switched from the switching position (a) to the switching position (b) based on the filling completion signal, so that the filling nozzle 7
6 before the plunger 80 is detached from the filling port 4.
Can be automatically closed, and leakage of the residual gas in the filling nozzle 76 to the outside can be more effectively prevented.

That is, during the charging operation of the liquefied gas, the direction switching valve 94 is switched to the switching position (a) in advance, and the air pressure from the air pump 92 is supplied toward the air introduction port 72E so that the charging valve 71 is switched. Are operated in the same manner as in the first embodiment. When the tip of the filling nozzle 76 is fitted to the filling port 4 of the cylinder 1 as illustrated in FIG. 1 and the filling completion signal is output from the controller in a state where the liquefied gas has been fixedly filled in the cylinder 1, By temporarily switching the direction switching valve 94 from the switching position (a) to the switching position (b) based on the filling completion signal, the rod side air chamber H in the sliding cylinder 77 is brought into the state shown in FIG. Can be released to the atmosphere through the air inlet 72E, and the biasing spring 91
As a result, the plunger 80 can be automatically closed.

Therefore, according to the present embodiment, the filling nozzle 7
The plunger 80 can be quickly and automatically closed even before the tube 6 is detached from the filling port portion 4, and the residual gas in the filling nozzle 76 can be more effectively prevented from leaking to the outside. Then, after the filling nozzle 76 is detached from the filling port 4, the direction switching valve 94 is returned to the switching position (a) again to prepare for the next filling operation.

Next, FIGS. 4 to 6 show a third embodiment of the present invention. The feature of this embodiment is that air pressure is externally applied to a bottom air chamber and a rod air chamber in a valve cylinder. By switching between supply and discharge, the plunger is driven in the axial direction to open and close the filling valve. In addition,
In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 101 denotes a filling valve for filling liquefied gas provided at the tip of the arm head 38B of the swing arm 38. The filling valve 101 is formed by a valve casing 102, a valve cylinder 104, a plunger 80 and the like which will be described later. It is configured.

Reference numeral 102 denotes a valve casing which constitutes the main body of the filling valve 101. The valve casing 102 comprises a cylindrical portion 102A and a mounting portion 102B, similarly to the valve casing 72 described in the first embodiment. The mounting portion 10
The upper end of 2B is fixed to the tip (lower end) of the arm head 38B of the swing arm 38. In the cylindrical portion 102A of the valve casing 102, a valve cylinder sliding hole 102C extending in the axial direction is formed, and the valve cylinder sliding hole 102C is formed.
A liquefied gas introduction port 102D and a pair of air supply / discharge ports 102E, 102F are formed apart from each other in the axial direction, and the liquefied gas introduction port 102D and the air supply / discharge ports 102E, 102F extend toward the mounting portion 102B.

The liquefied gas introduction port 102D is connected to the gas pipe 43 on the side of the mounting section 102B, and the air supply / discharge ports 102E and 102F are connected to air pipes 108A and 108, which will be described later.
08B is connected. Further, a valve seat 102G for the auxiliary valve element 82 is formed in the cylindrical portion 102A of the valve casing 102 between the valve cylinder sliding hole 102C and the liquefied gas inlet 102D. A breathing hole 102H communicating with the inside of the valve cylinder sliding hole 102C is formed in the distal end side in the radial direction.

Reference numeral 103 denotes a cylindrical sleeve which is inserted into the base end of the cylindrical portion 102A and is positioned within the cylindrical portion 102A by a retaining ring 74. The sleeve 103 is spaced apart in the axial direction and has an outer periphery. Two annular grooves 103A, 103 opening to the side
B, and two radial holes 103C and 103D extending radially inward from the annular grooves 103A and 103B. The annular groove 103A and the radial hole 103C of the sleeve 103 are always in communication with the air supply / discharge port 102E, and the annular groove 103B and the radial hole 103D are always in communication with the air supply / discharge port 102F. The sleeve 10
Reference numeral 3 denotes a part of the valve casing 102, the inner peripheral surface of which is a part of the valve cylinder sliding hole 102C.

Reference numeral 104 denotes a valve cylinder slidably inserted into a valve cylinder sliding hole 102C of the valve casing 102. The valve cylinder 104 is substantially the same as the valve cylinder 75 described in the first embodiment. A filling nozzle 105 having a plunger insertion hole 105A, a valve seat 105B, an annular concave portion 105C, and a radial hole 105D, and is provided by being screwed to a base end side of the filling nozzle 105, and has a bottom-side air chamber G therein. And a sliding cylinder 106 defined by a piston 81 and a rod-side air chamber H, and the base end of the sliding cylinder 106 is closed by a lid 78.

However, in the valve cylinder 104, the sliding cylinder 106
The air chambers G and H are connected to the air supply / discharge port 1 of the valve casing 102.
02E and 102F, the annular groove 103A of the sleeve 103,
Communication passages 106A and 106B are formed to communicate with each other via 103B and radial holes 103C and 103D. The communication path 106A is connected to the filling nozzle 105.
Even when the (sliding cylinder 106) slides and displaces in the directions indicated by arrows E and F, the air chamber H is always kept in the radial hole 103C and the annular groove 1C.
The communication passage 106B allows the air chamber G to always communicate with the air supply / discharge port 102F through the radial hole 103D and the annular groove 103B.

Reference numeral 107 denotes a bottom side air chamber G of the sliding cylinder 106.
And a biasing spring 107 disposed between the lid 78 and the piston 81, and the biasing spring 107 constantly moves the plunger 80 via the piston 81 in the direction of arrow F1 (valve closing direction). For example, when the air pump 109 (to be described later) is stopped or when the air lines 108A and 108B fail, the plunger 8 is turned on.
By maintaining 0 in the valve closed state, safety is ensured.

108A and 108B are the valve casing 102
An air line connecting the air supply / discharge ports 102E and 102F to an air pump 109 serving as an air source. Reference numeral 110 denotes a direction switching valve provided in the middle of the air lines 108A and 108B.
The directional control valve 110 includes a pair of pilot units 110A, 1A.
When a pilot air pressure as an external signal is supplied to the pilot units 110A and 110B, the switching positions (a) and (b) are constituted by a 5-port 2-position pneumatic directional switching valve having a 10B. The switching is controlled to (b).

The directional control valve 110 supplies the air pressure from the air pump 109 to the air supply / discharge port 102F through one air line 108A at the switching position (a), and through the other air line 108B. To open the air supply / discharge port 102E to the atmosphere. As a result, the filling valve 101 drives the plunger 80 in the direction of arrow F1 when the bottom side air chamber G becomes high pressure, and automatically closes the valve. When the direction switching valve 110 is switched from the switching position (a) to the switching position (b),
The air pressure from the air pump 109 is supplied to the air supply / discharge port 102E via the air pipe 108B, and the air supply / discharge port 102F is opened to the atmosphere via the air pipe 108A. As a result, the filling valve 101 drives the plunger 80 in the direction of the arrow E1 when the pressure in the rod-side air chamber H becomes high, so that the valve is automatically opened.

Next, in FIG. 5, reference numeral 111 denotes a filling machine.
The controller 111 is constituted by a microcomputer or the like, and its input side is connected to a start switch 112 for driving and stopping the air pump 109, a filling start sensor 113, a filling completion sensor 114, and the like. Direction switching valve 11 on the output side
0, filling control valve 115 and air motor control valve 11
6 and so on. And the controller 111
Stores the program shown in FIG. 6 in its storage circuit,
A liquefied gas charging control process and the like are performed.

The filling start sensor 113 is constituted by, for example, a limit switch attached to the air cylinder 49, the rod 49A of the air cylinder 49 is extended, and the filling nozzle 105 of the filling valve 101 is used to fill the cylinder 1. When fitted to the mouth 4, the controller 11
1 to output a filling start signal. The filling completion sensor 114 is constituted by, for example, a flow meter or a weighing scale which detects whether or not the liquefied gas is fixedly filled in the cylinder 1. To output a filling completion signal.

On the other hand, the filling control valve 115 is disposed in the middle of a pipe (both not shown) connecting the gas pipe 43 to the liquefied gas storage tank, and based on the filling start signal at the time of filling the liquefied gas. By opening the valve, the liquefied gas is allowed to flow from the storage tank toward the filling valve 101, and when the filling completion signal is output, the valve is closed to prevent the flow of the liquefied gas. . The air motor control valve 116 is disposed in the middle of an air conduit (both not shown) for connecting the air motor 18 to an air source shown in FIG. Is driven and stopped.

Next, referring to FIG.
A description will be given of a liquefied gas charging control process according to the present invention.

First, when the processing operation is started, it is determined in step 1 whether or not the air pump 109 is driven based on a signal from the start switch 112, and "YES" is determined.
When the determination is made, the air pump 109 is driven and the filling machine 10 is in operation, so that the process proceeds to step 2 where the direction switching valve 110 is switched to the switching position (a).

Then, as shown in FIG.
Is supplied to the air supply / discharge port 102F via one air pipe 108A and the air supply / discharge port 102E is opened to the atmosphere via the other air pipe 108B.
With the bottom air chamber G of the filling valve 101 set to a high pressure, the plunger 80 is driven in the direction of arrow F1 to
1 is kept closed.

Next, in step 3, the filling start sensor 11
3 to determine whether or not a filling start signal has been output;
While the determination is “NO”, the process returns to step 2 to hold the direction switching valve 110 at the switching position (a).

If the determination in step 3 is "YES", for example, the rod 49A of the air cylinder 49 is extended, and the filling nozzle 105 of the filling valve 101 is fitted to the filling port 4 of the cylinder 1. Since the filling start signal has been output, the process proceeds to step 4 to switch the direction switching valve 110 to the switching position (b), and the air pump 109
From the air supply / discharge port 1 through the air line 108B.
02E, and the air supply / discharge port 102F is opened to the atmosphere via the air line 108A, whereby the filling valve 1
Then, the plunger 80 is driven in the direction of arrow E1 to open the filling valve 101 automatically.

Next, in step 5, by switching the air motor control valve 116 based on the filling start signal, the air motor 18 shown in FIG.
The valve opening / closing head 31 rotates the valve handle 6 of the cylinder 1 in the valve opening direction, opens the filling control valve 115, and fills the liquefied gas in the storage tank with the filling valve 101.
Is filled into the cylinder 1 via.

Next, the routine proceeds to step 6, where it is determined whether or not the filling completion signal has been output by the filling completion sensor 114. If the determination is "NO", the flow returns to step 4 to continue the subsequent processing. I do. Then, in step 6, "Y
When the determination is "ES", the process proceeds to step 7, the air motor 18 is rotated in the reverse direction, the valve opening / closing head 31 rotates the valve handle 6 of the cylinder 1 in the valve closing direction, and the filling control valve 115 is closed. The liquefied gas is prevented from flowing from the storage tank toward the filling valve 101.

Next, in step 8, the direction switching valve 110 is switched from the switching position ( b) to the switching position (a) based on the filling completion signal, and the air pressure from the air pump 109 is supplied to the air via the air line 108A. Supply to the outlet 102F,
By setting the pressure in the bottom-side air chamber G of the filling valve 101 to a high pressure, the plunger 80 is driven in the direction of arrow F1 to automatically close the filling valve 101 again.

In step 9, the air cylinder 49
By reducing the rod 49A of the
The filling nozzle 105 of No. 01 is detached from the filling port 4 of the cylinder 1 and the entire filling machine 10 is lifted so as to be lifted upward, and waits for the next cylinder 1 to be conveyed to the filling station. Then, every time the next cylinder 1 is transported, the processing from step 1 to step 9 is repeated.

On the other hand, if "NO" is determined in the step 1, since the air pump 109 is stopped, the process proceeds to the step 10 and returns. In this state, the air chambers G and H of the filling valve 101 are both in the atmospheric pressure state.
When the plunger 80 is pressed in the direction indicated by the arrow F1 in the middle, the plunger 80 can be automatically kept closed.

Thus, in this embodiment having the above-described structure, substantially the same operation and effect as those of the first embodiment can be obtained.
1 is inserted into the filling port 4 of the cylinder 1, and before and after filling the liquefied gas into the cylinder 1, based on a filling start signal and a filling completion signal from the controller 111, a direction switching valve. By automatically switching 110 to the switching position (b) and the switching position (a), the filling nozzle 10
The plunger 80 can be automatically opened and closed even when the nozzle 5 remains fitted to the filling port 4, effectively eliminating the problem that the residual gas in the filling nozzle 76 leaks outside. it can.

In each of the above embodiments, the swing arm 38 is provided on the upper end side of the head casing 11 via the hanger 12.
It is described that the filling nozzle 76 (105) of the filling valve 71 (101) is fitted to the filling port 4 of the cylinder 1 by swinging the swing arm 38 with the air cylinder 49. The present invention is not limited to this. For example, a support arm or the like as a valve moving means is provided so as to be movable in a horizontal direction (radial direction of the head casing 11) with respect to the head casing 11, and the support arm is driven by an air cylinder or the like. Thus, the filling valve 71 (101) may be moved toward the filling port 4.

Further, the applicant of the present invention has described, for example,
As proposed in Japanese Patent No. 250462, a support arm as a connector body extending in the vertical direction is provided so as to be movable in the radial direction of the head casing, and a filling nozzle provided at a lower end side of the support arm is clamped by an air cylinder via a clamp mechanism or the like. May be fitted to the filling port.

Further, in each of the above embodiments, the valve handle 6 of the cylinder 1 is opened and closed by the valve opening / closing head 31 provided on the head casing 11, but instead, for example, the operator manually operates the valve handle 6. The valve handle 6 may be opened and closed. In this case, the filling nozzle 76 (10) of the filling valve 71 (101) may be used.
The valve moving means for moving 5) toward the filling port 4 of the cylinder 1 may be constituted by an air cylinder or the like, and the filling valve 71 (101) may be attached to the rod tip side of this air cylinder.

Further, in each of the above embodiments, the cylinder 1 called a siphon tube was described as an example of the cylinder for filling the liquefied gas. However, the present invention is not limited to this, and various cylinders such as a 20 kg cylinder may be used. It is needless to say that the present invention can also be applied to a case where a liquefied gas is automatically filled in a cylinder having a shape.

[0126]

According to the present invention, as described in detail above , the liquefied gas is provided on the valve casing of the charging valve.
Air inlet, air inlet, and air outlet, and
For charging, the tip side is inserted into the filling port of the cylinder.
A valve cylinder serving as a filling nozzle is slidably provided;
A plunger is provided on the cylinder so as to be relatively displaceable.
Opening and closing the filling nozzle of the valve cylinder on the tip side of the valve
The plunger is slid in the axial direction in the valve cylinder by the supply and discharge of air pressure through the air inlet and the air outlet of the valve casing, and the filling nozzle is reliably opened and closed at the distal end side. Therefore, the response at the time of opening and closing the valve can be improved. Therefore, the plunger (valve element) can be quickly opened and closed by supplying and discharging air pressure from the outside at the time of filling and completion of the liquefied gas, and the responsiveness can be reliably improved. Leakage of the residual gas in the filling nozzle can be prevented from leaking to the outside, and safety in the filling factory can be reliably increased.

In this case, as in the second aspect of the present invention,
At the base end of the plunger, a rod-side air chamber is provided in the valve cylinder.
A piston that defines the bottom side air chamber is provided integrally.
The air inlet of the valve casing and the air
Air pressure can be selectively supplied to and exhausted from each air chamber through the exhaust port.
When the plunger is driven in the axial direction,
Open in the end side, it is closes Rukoto.

Further, according to the third aspect of the present invention, a valve
Switching passage means is provided between the
The rod side air chamber and the bottom side air chamber are
Selective connection for air inlet and air outlet
With the configuration, after filling the liquefied gas, the filling nozzle
When removing the valve from the filling port of the cylinder,
Air sliding into the bottom side air chamber
Air pressure can be introduced from the inlet, and the air in the bottom
Pressure to close the plunger and raise the filling valve automatically.
There have responsiveness can Rukoto is closed.

[0129] Further, in the invention according to claim 4, in the same manner as the invention of claims 1 to 3 described above, provided with a switching換通path means between the valve housing and the valve cylinder, by the spring <br / > Ri rod side air chamber within the valve cylinder via the sections換通path means, the air inlet of the valve casing bottom side air chamber, because has a configuration for switching and connected in pairs by election択的the air outlet, liquefied When filling gas , the valve cylinder is opened by external force acting on the filling nozzle .
The Rukoto is slidably displaced against the pulling rod side d through switching換通path means the air pressure from the air inlet
Can be introduced into the A chamber, a plunger in the air pressure pushes the valve opening direction through the piston, it can automatically be opened the filling nozzle. When the time of completion of filling an attempt to disengage the fill Nozzle from the filling opening of Bonn <br/> base, because the valve cylinder is pushed back by the spring in a direction to protrude from the valve housing, the rod side by the switching換通passage means The air chamber can be connected to the air outlet, and the bottom air chamber can be connected to the air inlet, and the air pressure in the bottom air chamber presses the plunger through the piston in the valve closing direction to automatically turn on the filling nozzle.
It can be closed in. Therefore, the plunger (valve element) is supplied by supplying and discharging air pressure from the outside when charging and completion of liquefied gas
The valve can be opened and closed quickly, responsiveness can be improved reliably, and the residual gas in the filling nozzle can be prevented from leaking to the outside when the plunger is closed. It can certainly be increased.

Further, as in the fifth aspect of the present invention, a biasing means for biasing the plunger in a valve closing direction via a piston is provided in the bottom side air chamber, and the air inlet of the valve casing is closed. A directional switching valve for selectively switching the air introduction port between the air source and the atmosphere by an external signal is provided in the middle of the air pipe connected to the air source.
The Rukoto withdrawal, the rod side air chamber by switching the directional control valve during the filling completion when the atmospheric pressure, the plunger can be urged in the valve closing direction by the biasing means, the filling nozzle from the filling opening of the cylinder Before closing, the filling valve can be quickly and automatically closed.

[0131] On the other hand, as the invention described in claim 6, Benke
Liquefied gas introduction port is communicated with the inside of the valve cylinder and shut off
By providing the auxiliary valve element to be provided in the valve cylinder,
Filling the cylinder with the tip of the filling nozzle
Until it is fitted to the mouth and external force acts on the filling nozzle,
The valve body can be closed to ensure liquefied gas leakage
Can be prevented. Then, external force acts on the filling nozzle and the valve cylinder is
Open the auxiliary valve when sliding displacement occurs in the valve casing
By doing so, it is possible to set the filling work
The valve fills with the auxiliary valve and plunger (valve).
The opening and closing operation of the valve can be set in two stages.
Safety in the hall can be greatly improved .

Further, in the invention according to claim 7 , the filling bar is provided.
A pair of air supply / discharge ports are formed in the valve casing of the lube.
In the middle of the air line connecting the air supply / discharge port to the air source,
Each air supply / exhaust port can be selectively selected between the air source and the atmosphere by the unit signal.
Provided with a directional control valve for switching connection, communicating a liquefied gas inlet of the valve casing to the valve cylinder, the auxiliary valve body to block from has a configuration provided in the valve cylinder in the claim
The opening and closing operations of the filling valve can be set in two stages by the auxiliary valve element and the plunger (valve element) in substantially the same manner as in the invention of the sixth aspect, and the safety in the filling factory can be greatly improved.
Then, the direction switching valve is switched to one switching position.
Supply air pressure from the air source to the rod side air chamber
To open the plunger and switch the filling nozzle to air pressure
Can open quickly Also, directional switching valve
When the air pressure is switched to the other
The plunger closes quickly by supplying to the side air chamber.
Can be valved.

Furthermore, a head casing is disposed above the liquefied gas filling cylinder so as to be able to move up and down, and the head casing opens and closes a valve of the cylinder. By providing a head and arranging the filling valve movably via the valve moving means, the valve of the cylinder can be automatically opened and closed by the valve opening / closing head, and the filling valve is automatically operated in conjunction with this. The valve can be opened and closed at any time, which effectively automates the charging operation of the liquefied gas.
It produces various effects.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a filling valve and the like of a liquefied gas filling apparatus according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a state where the filling valve of FIG. 1 is detached from a filling port of a cylinder.

FIG. 3 is a longitudinal sectional view showing a filling valve and the like of a liquefied gas filling apparatus according to a second embodiment.

FIG. 4 is a longitudinal sectional view showing a filling valve and the like of a liquefied gas filling apparatus according to a third embodiment.

FIG. 5 is a control block diagram of a liquefied gas filling apparatus according to a third embodiment.

FIG. 6 is a flowchart showing liquefied gas filling control processing by a controller.

FIG. 7 is a partial cross-sectional view showing a conventional liquefied gas filling cylinder.

FIG. 8 is a partially broken external view showing a charged state of a liquefied gas filling apparatus according to a conventional technique.

FIG. 9 is an enlarged sectional view taken in the direction of arrows IX-IX in FIG.

FIG. 10 is an exploded perspective view of the hanger and the swing arm shown in FIG. 8;

FIG. 11 is an enlarged longitudinal sectional view showing a main part in FIG. 8;

FIG. 12 is an enlarged sectional view taken in the direction of arrows XII-XII in FIG. 8;

FIG. 13 is an enlarged right side view of FIG. 8 showing a swing arm and the like.

FIG. 14 is an enlarged cross-sectional view showing the operation valve in a direction indicated by arrows XIV-XIV in FIG. 13;

FIG. 15 is a partially broken external view showing a standby state of the liquefied gas filling apparatus.

FIG. 16 is an enlarged longitudinal sectional view showing a filling valve and the like in FIG. 8;

[Explanation of symbols]

 Reference Signs List 1 cylinder 3 valve body 4 filling port 6 valve handle 11 head casing 18 air motor 31 valve opening / closing head 38 swing arm (valve moving means) 49 air cylinder 71, 101 filling valve 72, 102 valve casing 72C, 102C sliding of valve cylinder Hole 72D, 102D Liquefied gas inlet 72E Air inlet 72F, 72G Air outlet 73, 103 Sleeve 75, 104 Valve cylinder 76, 105 Filling nozzle 77, 106 Sliding cylinder 77A, 77B Switching passage (switching passage means) 80 Plunger (Valve body) 80A Valve portion 81 Piston 82 Auxiliary valve body 83 Spring 91, 107 Biasing spring (Biasing means) 92, 109 Air pump (Air source) 93, 108A, 108B Air line 94, 110 Direction switching valve 102E, 102F Air supply / discharge port 10 A, 106B communicating path G, H air chamber

Claims (8)

(57) [Claims] A filling valve provided with a filling nozzle on one side, and a filling valve provided on the other side of the filling valve, which is detachably fitted to a filling port of a liquefied gas filling cylinder. in liquefied gas filling device comprising a valve moving means for moving the filling valve toward the fill opening, the the filling valve has a valve cylinder slidably Doana, spaced in the axial direction of the valve cylinder sliding hole A valve casing in which a liquefied gas inlet, an air inlet, and an air outlet are formed; at least a base end side is slidably provided in a valve sleeve sliding hole of the valve casing; a valve cylinder became filled nozzle is fitted, it is disposed between the valve casing and valve tube, the filling
A spring that constantly urges the valve cylinder in a direction in which the nozzle projects from the valve casing; and a rod-shaped valve body that extends in the valve cylinder in the axial direction, and is displaced in the valve cylinder in the axial direction. , Tip side
The filling nozzle opening valve portion of the valve barrel, and a closes plunger, by the air pressure supplied and drained the plunger through the air inlet and the air outlet of the valve casing, the valve Liquefaction characterized in that the filling nozzle is opened and closed by slidingly displacing the inside of the cylinder in the axial direction, and the liquefied gas from the liquefied gas inlet is filled into the cylinder via the filling nozzle. Gas filling equipment. 2. A piston defining a rod-side air chamber and a bottom-side air chamber is integrally provided in the valve cylinder at a base end side of the plunger, and each of the air chambers is configured to introduce air into the valve casing. The liquefied gas filling apparatus according to claim 1, wherein the plunger is driven to open and close in the axial direction by supplying and discharging air pressure through a port and an air discharge port. 3. A rod-side air chamber and a bottom-side air chamber in the valve cylinder are selectively switched between an air inlet and an air outlet of the valve casing between the valve casing and the valve cylinder. A switching passage means is provided for connecting the rod-side air chamber to an air discharge port and the bottom-side air chamber to an air introduction port, and an external force acts on the filling nozzle. 3. The structure according to claim 2, wherein the rod-side air chamber is connected to an air inlet and the bottom-side air chamber is connected to the air outlet when the valve cylinder is slid in the valve casing. Liquefied gas filling equipment. 4. A filling valve provided with a filling nozzle on one side, and a filling valve provided on the other side of the filling valve, which is detachably fitted to a filling port of a liquefied gas filling cylinder. in liquefied gas filling device comprising a valve moving means for moving the filling valve toward the filling opening, the filling valve has a valve cylinder slidably Doana, spaced in the axial direction of the valve cylinder sliding hole A valve casing in which a liquefied gas inlet, an air inlet and an air outlet are formed, at least a base end side of which is slidably provided in a valve cylinder sliding hole of the valve casing, and a distal end side of which is fitted in the filling port. a valve cylinder became filled nozzle is worn, is formed as a valve body of the rod-like extending the valve in the cylinder in the axial direction,
By displacing the valve in the cylinder in the axial direction, the field of the filling nozzle of the distal valve unit valve cylinder opens, and closes a plunger, and a rod-side air chamber and the bottom-side air chamber within the valve cylinder The plunger is provided at the base end side of the plunger so that air pressure from the outside is supplied to each of the air chambers through an air introduction port and an air supply / discharge port of the valve casing. An axially driven piston is provided between the valve casing and the valve cylinder, and a rod-side air chamber and a bottom-side air chamber in the valve cylinder are connected to an air inlet and an air outlet of the valve casing. Switching passage means for selectively switching connection, and disposed between the valve casing and the valve cylinder;
Place the valve cylinder in the direction in which the filling nozzle projects from the valve casing.
And the rod-side air chamber is urged through the switching passage means.
To the air discharge port and the bottom side air chamber
Connected to the air inlet, external force acts on the filling nozzle
The valve cylinder is moved in the valve casing against the biasing force.
Allow sliding displacement, and
Connect the rod side air chamber to the air introduction port and
Spring connecting the Tom side air chamber to the air outlet
Liquefied gas filling apparatus characterized by being configured from a. 5. An air pipe for connecting the air inlet of the valve casing to an air source is provided in the bottom-side air chamber for urging the plunger in a valve closing direction via a piston. 5. The liquefied gas filling apparatus according to claim 2, wherein a directional switching valve for selectively switching the air introduction port between an air source and the atmosphere by an external signal is provided on the way. 6. The valve cylinder is provided with an auxiliary valve body for communicating and shutting off the liquefied gas introduction port with respect to the inside of the valve cylinder, and the auxiliary valve body is constantly urged in a valve closing direction by the spring. 6. The liquefied gas filling apparatus according to claim 1, wherein the valve is opened when an external force acts on the filling nozzle and the valve cylinder slides and displaces in the valve casing. 7. A filling valve provided with a filling nozzle on one side, and a filling valve provided on the other side of the filling valve, wherein the filling nozzle is detachably fitted to a filling port of a liquefied gas filling cylinder. in liquefied gas filling device comprising a valve moving means for moving the filling valve toward the filling opening, the filling valve has a valve cylinder slidably Doana, spaced in the axial direction of the valve cylinder sliding hole A valve casing having a liquefied gas introduction port and a pair of air supply / discharge ports formed therein, at least a base end side of which is slidably provided in a valve cylinder sliding hole of the valve casing, and a distal end side fitted to the filling port. A valve cylinder serving as a filling nozzle to be provided, provided in the valve cylinder so as to communicate and shut off the liquefied gas introduction port with respect to the inside of the valve cylinder, and is always kept closed by a spring; The valve cylinder slides due to external force An auxiliary valve element that opens when the valve is opened, and is formed as a rod-shaped valve element that extends in the valve cylinder in the axial direction, and is displaced in the valve cylinder in the axial direction, so that the distal end side
And a rod-side air chamber and a bottom-side air chamber which are provided on the base end side of the plunger and individually communicate with the pair of air supply / discharge ports. A piston defined in the valve cylinder, provided in the middle of an air pipe connecting each of the air supply and discharge ports to an air source, and selectively controlling each of the air supply and discharge ports to an air source and the atmosphere by an external signal. A directional control valve for switching connection to the directional control valve. The directional control valve opens the plunger by supplying air pressure from an air source to the rod side air chamber at one switching position, and opens the plunger at the other switching position. A liquefied gas filling apparatus, wherein the plunger is closed by supplying the air pressure to a bottom side air chamber. 8. A head casing is provided above the liquefied gas filling cylinder so as to be able to move up and down, and a valve opening / closing head for opening and closing a valve of the cylinder is provided in the head casing, and the valve moving means is provided. Claim 1, wherein the filling valve is movably provided through
The liquefied gas filling apparatus according to 2, 3, 4, 5, 6, or 7.