JPH0618155Y2 - Cylinder valve with automatic residual pressure valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a cylinder valve with an automatic residual pressure valve provided with a residual pressure valve for preventing external air and the like from entering the empty cylinder.

(Prior art) A cylinder consisting only of a main valve has a large amount of impurities such as outside air, dust, water, and oil when it is left empty without forgetting to close the main valve when it becomes empty. I will enter.

Since the impurities may contaminate the newly filled gas and reduce the purity, the empty cylinders collected from the customer must be washed with water, dried, and then purged to remove the impurities. There is.

This work requires a great deal of time, labor and equipment and is not preferable.

A residual pressure valve for a gas cylinder disclosed in Japanese Utility Model Laid-Open No. 62-37700 is known as a means for solving such an undesirable defect.

The residual pressure valve for gas cylinders described in this publication is as shown in FIG. That is, the inlet 52 of the gas stored in the gas cylinder 51, the filling valve chamber 53, the outlet valve chamber 54, and the outlet 55 are communicated in series on one center line 56 in series. The filling valve element 57 into the extraction valve chamber 54 and the extraction valve element 5 into the extraction valve chamber 54.
8 is inserted, a valve element stopper 59 is provided between the filling valve chamber 53 and the extraction valve chamber 54, and the filling valve element 57 and the extraction valve element 58 are valve closing stoppers 60 and 61, respectively. The center line 56 formed on the valve bodies 57 and 58 by pressing the valve faces 62 and 63 against each other by pressing the valve faces 62 and 63 against each other.
When the gas cylinder 51 is filled with gas, the filling gas is filled with the discharge port 55, the extraction valve chamber 54, and the extraction valve body 58. The valve closing pressure-receiving surface 67 of the filling valve body 57 is pressurized through the air passage 65 of the filling valve body 57, and the filling valve body 57 is pushed against the valve closing spring 60 and separated from the extracting valve body 58 to open the valve. The filling gas is further pressed into the gas cylinder 51 from the inlet 52 through the valve opening gap / the filling valve chamber 53 and the ventilation passage 64 of the filling valve body 57, and the gas contained in the gas cylinder 51 is removed from the cylinder. In the state of being taken out to the inside, the stored gas is introduced into the inlet port 52, the filling valve chamber 53, and the filling valve body 57 through the ventilation path 6
The valve opening pressure receiving surface 70 of the take-out valve body 58 is pressurized through 4 and the take-out valve chamber 54 to push the take-out valve body 58 against the valve closing spring 61 and away from the filling valve body 57. In the state where the valve is opened, the stored gas further flows out to the outside from the outlet 55 through the valve opening gap and the ventilation path 65 of the extraction valve body 58, and the internal pressure of the gas cylinder 51 is reduced to the residual pressure value, The valve closing spring 61 overcomes the internal pressure of the cylinder to bring the extraction valve element 58 into contact with the filling valve element 57 to close the valve, shut off the outflow of the stored gas, and prevent the internal pressure of the cylinder from falling below the residual pressure value. In addition, the ventilation passage 6 is provided in the central portion of the valve body 58 for extraction.
5, the female valve surface 63 is formed on the hole peripheral surface of the air passage 65, and a sealing ring 73 seals between the outer peripheral surface of the take-out valve body 58 and the peripheral surface of the valve chamber. A valve closing seal 75 is provided between the valve closing abutment surfaces of the male valve surface 62 and the female valve surface 63, which are configured to be stopped and project from the central portion of one end of the filling valve body 57. The air passage 64 is formed so as to penetrate from the central portion of the other end surface of the valve element to the outer peripheral portion of the one end surface of the valve element, and the outer peripheral surface of the valve element and the inner peripheral surface of the valve chamber are rubbed. It is configured by frictional contact through a contact body 76.

However, the residual pressure valve for a gas cylinder described in the above publication has the following problems. That is, a. The inlet 52 of the gas stored in the gas cylinder 51, the filling valve chamber 53, the outlet valve chamber 54, and the outlet 55 are connected in series on the center line 56 in order, and the filling valve chamber 5
3, the filling valve element 57 is inserted, the extraction valve element 54 is inserted into the extraction valve element 54, and the valve element stopper 59 is provided between the filling valve element 53 and the extraction valve element 54. 57 and the take-out valve body 58 are pressed to the valve body stopper 59 side by the valve closing springs 60 and 61, and the valve faces 62 and 63 are brought into contact with each other, so that the center formed on the valve bodies 57 and 58. Since it is an axial single-row array structure configured to block the mutual communication of the air passages 64, 65 running in the direction of the line 56,
It is suitable for manufacturing the axially long structure, but is not suitable for manufacturing the short structure.

b. A stopper 59 for preventing excessive return by the valve closing springs 60 and 61 is required between the filling valve body 57 and the extracting valve body 58, and the configuration is complicated.

c. In the state where the gas cylinder 51 is filled with gas, the filling gas is the outlet port 55, the extraction valve chamber 54, and the extraction valve body 5.
8, the valve closing pressure-receiving surface 67 of the filling valve body 57 is pressurized, and the filling valve body 57 is pushed against the valve closing spring 60 and separated from the extracting valve body 58 to open the valve. Then, the filling gas is further filled with the valve opening gap / filling valve chamber 53 and the filling valve body 57.
In the state in which the gas that has been stored in the gas cylinder 51 is pressed into the gas cylinder 51 from the inlet 52 through the ventilation passage 64 and the gas stored in the gas cylinder 51 is taken out of the cylinder, the stored gas is the inlet 52, the filling valve chamber 53, and the filling gas. The valve-opening pressure-receiving surface 7 of the take-out valve body 58 passes through the vent passage 64 of the valve body 57 and the take-out valve chamber 54.
0 is pressurized to push the take-out valve element 58 against the valve closing spring 61 and push it away from the filling valve element 57 to open the valve, so that the stored gas is further opened and the vent passage 65 of the take-out valve element 58 is opened. Since it is configured to flow out through the outlet port 55 to the outside, that is, the gas passage in the case of gas filling and the gas passage in the case of gas extraction (however, the gas flow directions are opposite). Therefore, it is not suitable for designing / manufacturing such as making the filling amount per unit time in the case of gas filling larger than the taking-out amount of gas taking out (that is, making gas filling easy).

d. An air passage 65 is formed in the central portion of the take-out valve body 58 so as to penetrate therethrough, and a female valve surface 63 is formed on the hole circumferential surface of the air passage 65, and the female valve surface 63 projects from the central portion of one end of the filling valve body 57. The valve closing abutment surface between the male type valve surface 72 and the female type valve surface 73 is sealed by a valve closing sealer 75, and the valve body one end surface from the center of the other end surface of the valve body Of the filling valve element 57 and the withdrawing valve element 58 are pressed against the valve element stopper 59 side by the valve closing springs 60 and 61 to form the valve surface 62. , 63 are brought into contact with each other so as to block the mutual communication of the air passages 64, 65 formed in the valve bodies 57, 58 and running in the direction of the center line 56, so that the internal pressure of the gas cylinder 51 is reduced. When the residual pressure value is reduced, the valve closing spring 61 overcomes the cylinder internal pressure and takes out the valve. The valve 58 is brought into contact with the filling valve body 57 to close the valve to block the outflow of the stored gas, that is, in the case of the residual pressure holding state as shown in FIG. The variable seal structure, in which the seal portion formed by the valve closing seal 62 and the valve closing seal 75 and the female valve surface 63 varies, is uncertain about the reliability of the sealing function at low pressure.

e. A male valve surface 72, which is sealed from the central portion of one end surface of the filling valve body 57 by sealing a gap between the outer peripheral surface of the take-out valve body 58 and the peripheral surface of the valve chamber, and the female shape. Valve face 73
Since the valve closing contact surface between and is sealed by the valve closing sealer 75, the sealing ring 73 and the friction contact body 76 are worn relatively quickly (the number of times of operation of both is different and wear In the state where the pressure contact force of the sealing ring 73 and the friction contact body 76 with respect to the inner peripheral surface of the valve chamber decreases differently as the wear progresses differently, and in the state where the variable seal structure is adopted. Since the holding residual pressure is obtained, the set value of the residual pressure becomes high as the setting value becomes long and the residual pressure holding function becomes slow.

f. The sealing ring 73 and the friction contact body 76 have sliding resistance, which is not preferable.

g. Since it is necessary to determine the set residual pressure from the value obtained by adding the sliding resistance force to the acting force of the valve closing spring 61, the setting is difficult.

(Problems to be Solved by the Invention) An object of the present invention is to provide a new cylinder valve with an automatic residual pressure valve that solves the above problems.

(Means for Solving the Problem) In order to achieve the above-mentioned object, a cylinder valve with an automatic residual pressure valve according to the present invention has a screw box 3 at the lower end of a valve box 1 and a neck part of a cylinder 2, and the valve box. 1 is provided with a vertically oriented through hole and a horizontally oriented through hole 7 that does not intersect with the vertically oriented through hole 5, and a main valve chamber 9 having a main valve seat 8 is formed at an intermediate portion of the vertically oriented through hole 5 and the same vertically oriented direction. The manually operated main valve 10 is screwed into the upper half portion of the through hole 5 in a state in which the main valve 10 is seated on the main valve seat 8 and closed and opened apart from the main valve seat 8, and the laterally oriented through hole 7 The left end is used as the gas outlet hole 12, and a connecting portion such as a pressure reducing valve is engraved on the inner peripheral surface of the gas outlet hole 12, and the right half portion of the laterally extending through hole 7 has a wide diameter, and the residual pressure valve chamber 13 on the inner peripheral wall surface of the cylinder is formed. A cone that forms a residual pressure valve chamber 13 and the main valve chamber 9 through an intermediate hole 11 and narrows to the left at the inner end of the residual pressure valve chamber 13. -Shaped first valve seat portion 14 is provided with a second female screw 15 on the inner peripheral surface of the outer end as well, and in the residual pressure valve chamber 13, the outer half of the left half is a conical surface 16 and the outer half of the right half is a polygonal surface. The inflow valve body 18 having the shape of 17 is inserted in a state where the ridge of the polygonal surface 17 slidably abuts on the cylindrical inner peripheral wall surface of the residual pressure valve chamber 13, and both ends of the inflow valve body 18 have the same inflow valve. A through hole 20 having a small diameter in the left half and a large diameter in the right half, which communicates with the left and right ends of the body 18, is formed in the large diameter portion 2 of the through hole 20.
1 has a cylindrical surface as the inner peripheral wall, and a bottomed cylindrical outflow valve body 23 having a polygonal surface 22 on the outer periphery is provided in the large diameter portion 21.
The ridge of the same is slidably in contact with the cylindrical inner peripheral wall surface of the large diameter portion 21 and the opening edge 24 is abuttable with the step portion 26 formed between the large diameter portion 21 and the small diameter portion 25. The outlet side guide hole 27 communicating inside and outside is formed in the surface between the ridges on the peripheral wall of the outflow valve body 23, and the cylindrical first end cover is provided inside the outer end of the large diameter portion 21. 28 is screwed, and a conical second valve seat portion 29 is seated on the inner circumference of the inner end of the first end lid 28, and the second valve seat portion 29 is seated on the outer surface of the bottom wall of the outflow valve body 23. The conical valve portions 30 that close the through holes 20 are provided, and the second end cap 31 is screwed to the second female screw 15, and the second end cap 31 and the first end cover 28 are connected to each other. The first spring 3 that presses the inflow valve body 18 to the left
2 between the step portion 26 and the outflow valve body 23.
The second springs 33 that press 3 to the right are respectively sandwiched.

(Embodiment) In the embodiment of the present invention shown in FIGS. 1 to 5, a cross-shaped valve box 1 having a male screw portion 3 for screwing to a neck portion of a cylinder 2 at a lower end thereof is formed, Vertically-oriented portions 5 of the valve box 1 are provided with vertical through-holes 5 opening at both upper and lower end surfaces of the same portion 4, and laterally-oriented portions 6 are also provided with laterally-oriented through holes 7 opening at both left and right end surfaces of the same portion 6. Drill 5 and 7 without crossing.

A main valve chamber 9 having a main valve seat 8 is formed at an intermediate portion of the vertical through hole 5, and a manual handle 3 is provided in an upper half portion of the vertical through hole 5.
5 and the main valve 10 that rotates in the left-right direction by the valve shaft 36 are screwed in such a state that the main valve 10 is seated on the main valve seat 8 and closed and opened apart from the main valve seat 8, and the left end of the lateral through hole 7 is inserted. As a gas outlet hole 12, a first female screw 12 'for connection of a pressure reducing valve or the like is engraved on the inner peripheral surface of the gas outlet hole 12, and the right half of the lateral through hole 7 has a wide diameter, A residual pressure valve chamber 13 is formed on the wall surface, and the residual pressure valve chamber 13 and the main valve chamber 9 are communicated with each other through an intermediate hole 11.

At the inner end of the residual pressure valve chamber 13, a conical first valve seat portion 14 narrowing to the left is provided, and at the inner peripheral surface of the outer end thereof, a second female screw 15 is also provided.
And the ridge of the polygonal surface 17 has a conical surface 16 on the left half and a polygonal surface 17 on the right half. Insert in the state of slidably contacting the inner wall surface of the cylinder.

The inflow valve body 18 has a through hole 20 in which both ends communicate with the left and right ends of the inflow valve body 18, the left half has a small diameter and the right half has a large diameter through hole 20, and an inner peripheral wall of a large diameter portion 21 of the through hole 20. Is a cylindrical surface, and the outer periphery of the large diameter portion 21 is a bottomed cylindrical outflow valve body 23 having a polygonal surface 22, and the ridge of the polygonal surface 22 slidably contacts the peripheral wall surface of the large diameter portion 21. The contacting state and the opening edge 24 are inserted into the stepped portion 26 formed between the large diameter portion 21 and the small diameter portion 25 in an abuttable state, and the peripheral edge of the outflow valve body 23 between the ridges. A guide hole 27 communicating with the inside and outside is opened on the surface.

A tubular first end cover 28 is screwed into the outer end of the large-diameter portion 21, and a conical second valve seat 29 is provided on the inner circumference of the inner end of the first end cover 28.
Further, conical valve portions 30 are provided on the outer surface of the bottom wall of the outflow valve body 23 to seat the second valve seat portion 29 and close the through hole 20.

A second end cover 31 is screwed onto the second female screw 15 to
The first spring 32 that presses the inflow valve body 18 to the left between the end cover 31 and the first end cover 28, and the outflow valve body 23 to the right between the step portion 26 and the outflow valve body 23. The second springs 33 are sandwiched in between.

In the figure, reference numeral 38 denotes a safety valve chamber formed in a rearward opening shape, and 39 denotes a safety valve screwed into the safety valve chamber 38 from the rear.

(Operation) When the manual handle 35 is opened in a state where the cylinder 2 is filled with gas, the gas in the cylinder 2 flows into the residual pressure valve chamber 13 through the main valve chamber 9 and the intermediate hole 11, and the outflow valve body 23
To the left against the acting force of the second spring 33,
The inner diameter hole of the end cover 28, the guide hole 27, the inside of the outflow valve body 23, the small diameter portion 25, and the gas outlet hole 12 are passed through in the order listed and the first female screw 12 '
Flows to a pressure reducing valve or the like connected to.

When the internal pressure of the cylinder 2 drops to a set residual pressure close to empty, the valve opening force of the gas that flows in from the inner diameter hole of the first end cover 28 and pushes the inflow valve body 23 is larger than the valve closing force of the second spring 33. It becomes weak, and the outflow valve body 23 remains with the set residual pressure remaining in the cylinder 2.
Is automatically closed by the second spring 33. Therefore, for example, even if the main valve 10 is left open, the second valve
Closing the outflow valve body 23 by the spring 33 and the first spring 31
Due to the closing of the inflow valve body 18 by this, impurities from the outside such as the outside air do not enter the cylinder 2.

When collecting the empty cylinder 2 and refilling it with gas, the gas filling port of the gas filling device is connected to the gas outlet hole 12 using the first female screw 12 ', and the main valve 10 is connected. It opens and the filling gas is pressure-fed toward the cylinder 2. Then, the filling gas pushes the inflow valve body 18 against the first spring 32 by the gas pressure, and opens between the polygonal surface of the inflow valve body 18 and the inner surface of the residual pressure valve body 13, the intermediate hole 11, the main valve chamber. Cylinder 2 through 9 in the order listed
It flows in and is filled. When this gas filling is completed, the main valve 1
When the gas filling port is removed from the gas outlet hole 12 after closing 0, the inflow valve body 18 automatically closes the first spring 32 by the acting force.

(Effect of the Invention) Since the cylinder valve with the automatic residual pressure valve according to the present invention has the above-mentioned configuration, the following effects can be obtained.

A. Since the outflow valve body 23 and the second spring 33 are built in the inflow valve body 18, it is suitable for manufacturing those having a short axial dimension.

B. Since the inflow valve body 18 is seated on the first valve seat portion 14 and the outflow valve body 23 is seated on the second valve seat portion 29, respectively,
The stopper 59 as in the residual pressure valve for a gas cylinder disclosed in the above-mentioned publication is not possible, and the structure is simple.

C. As described in the above operation, the gas passage when the gas is filled in the cylinder 2 is different from the gas passage when the gas is discharged from the cylinder 2, and when the gas is filled, the inflow valve body having a large diameter is used. The gas flows around 18 at a large flow rate, and in the case of gas discharge, the outflow valve body 2 having a small diameter
Since it flows around 3, it facilitates the design / manufacturing of a product in which the filling amount per unit time in the case of gas filling is larger than the discharge amount per unit time in the case of gas discharging.

D. In the case of the residual pressure holding state (see FIG. 2), the inflow valve body 1
8 is the first valve seat portion 14, and the inflow valve body 23 is the second valve seat portion 29.
Since the fixed seal structure has a sealing function by seating on each of them, the reliability of the seal function at low pressure is higher than that of the movable seal structure described in the above publication.

E. An inflow valve body 18 having a polygonal surface 17 on the outer circumference in the residual pressure valve chamber 13 having a cylindrical inner wall surface, and an outflow valve 18 having a polygonal surface 22 on the outer circumference in the inflow valve body 18 having a cylindrical inner wall surface. Since the body 23 is inserted with the ridges of the polygonal surfaces 17 and 22 slidably abutting on the inner peripheral wall surface of the cylinder, sealing as in the residual pressure valve for a gas cylinder described in the above-mentioned publication is performed. Since neither the ring 73 nor the frictional contact body 76 is needed, the slowness of the residual pressure holding function, the reduction of the sliding resistance force, and the setting of the residual pressure point as described in the above e, f, g are eliminated. Can be achieved (determined by the value of the acting force of the second spring 33 in the case of the present invention).

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the present invention. 2 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is a cross-sectional view taken along the line BB of FIG. 2, and FIG. 4 is a state at the time of releasing gas. 5 is a sectional view taken along the line, and FIG. 5 is a sectional view taken along the line AA in FIG.
The figure is a cross-sectional view showing a conventional example. 1 ... Valve box, 2 ... Cylinder, 3 ... Screwed section, 4 ... Vertical section, 5
... vertical through-hole, 6 ... horizontal-direction portion, 7 ... horizontal through-hole, 8 ... main valve seat, 9 ... main valve chamber, 10 ... main valve, 11 ... intermediate hole, 12 ...
Gas outlet hole, 12 ... First female screw, 13 ... Residual pressure valve chamber, 14
... first valve seat portion, 15 ... second internal thread, 16 ... conical surface, 1
7 ... Polygonal surface, 18 ... Inflow valve body, 20 ... Through hole, 21 ...
Large diameter part, 22 ... Polygonal surface, 23 ... Outflow valve body, 24 ... Opening edge, 25 ... Small diameter part, 26 ... Step part, 27 ... Guide hole, 28 ... First end cover, 29 ... Second valve seat Part, 30 ... Valve part, 31 ... Second end cover, 32 ... First spring, 33 ... Second spring, 35 ... Manual handle, 36 ... Valve shaft, 38 ... Safety valve chamber, 39 ... Safety valve.

Claims (1)

[Scope of utility model registration request] 1. A valve box (1) is provided with a threaded portion (3) to a neck of a cylinder (2), and the valve box (1) is provided with a vertical through hole and a horizontal through hole (7) which does not intersect with the vertical through hole (5). , A main valve chamber 9 having a main valve seat 8 is formed at an intermediate portion of the vertical through hole 5, and a manually operated main valve 10 is provided in an upper half portion of the vertical through hole 5. 8 is seated on and closed and is opened apart from the main valve seat 8 and screwed in, and the left end of the lateral through hole 7 is connected to the gas outlet hole 1
2, a connecting portion such as a pressure reducing valve is engraved on the inner peripheral surface of the gas outlet hole 12, and the right half portion of the lateral through hole 7 has a wide diameter to form a residual pressure valve chamber 13 on the inner wall surface of the cylinder. Pressure valve chamber 1
3 and the main valve chamber 9 are communicated with each other through an intermediate hole 11, and the residual pressure valve chamber 13
Conical first valve seat portion 14 narrowing to the left at the inner end of the
Similarly, a second female screw 15 is provided on the inner peripheral surface of the outer end, and an inflow valve body 18 in which the outer periphery of the left half has a conical surface 16 and the outer periphery of the right half has a polygonal surface 17 is provided in the residual pressure valve chamber 13. , Polygonal face 1
The ridge 7 is inserted into the residual pressure valve chamber 13 slidably in contact with the inner peripheral wall surface of the cylinder, and the left half of the inlet valve body 18 having both ends communicating with the left and right ends of the inlet valve body 18 is thin. A through hole 20 having a large diameter in the right half is bored, the inner peripheral wall of the large diameter portion 21 of the through hole 20 is a cylindrical surface, and the outer periphery of the large diameter portion 21 is a cylindrical surface with a polygonal surface 22 and a bottom. The outflow valve body 23 is formed in a state where the ridge of the polygonal surface 22 slidably abuts on the cylindrical inner peripheral wall surface of the large diameter portion 21 and the opening edge 24 is formed between the large diameter portion 21 and the small diameter portion 25. It is charged into the stepped portion 26 that is abutted in a freely movable state, and the outflow valve body 23
An outflow-side guide hole 27 that communicates with the inside and outside is formed on the surface between the ridges on the peripheral wall of the, and a cylindrical first end cover 28 is screwed into the outer end of the large diameter portion 21, and the first end cover is attached. The conical second valve seat portion 29 is seated on the inner circumference of the inner end of the valve 28, and the second valve seat portion 29 is seated on the outer surface of the bottom wall of the outflow valve body 23 to close the through hole 20. A conical valve portion 30 is provided, and a second end cover 31 is screwed to the second female screw 15, and the inflow valve body 18 is pressed leftward between the second end cover 31 and the first end cover 28. A cylinder valve with an automatic residual pressure valve, comprising: a first spring 32; and a second spring 33 that presses the outflow valve body 23 to the right between the step portion 26 and the outflow valve body 23.