JP2001108197A - Liquefied petroleum gas supply equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent a malfunction of a gas release preventing device by suppressing a fluctuation of an inlet pressure in the gas release preventing device. SOLUTION: A gas extraction valve is provided in a bulk storage tank in which liquefied petroleum gas is stored, and a primary pressure regulator 31 and a secondary pressure regulator 33 are sequentially provided in a piping system connected to the gas extraction valve. On the gas outlet passage 41 side of the primary pressure regulator 31, a gas release preventing device 43 for blocking passage of gas at a gas flow rate exceeding a specified value is incorporated. Outgassing prevention device 43
The overflow prevention valve 5
3 blocks the flow path.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied petroleum gas supply device for supplying a gas from a gas storage section in which liquefied petroleum gas is stored.

[0002]

2. Description of the Related Art In general, liquefied petroleum gas for home use or business use (hereinafter referred to as "LP gas") is supplied in a cylinder type in which a cylinder-shaped LP gas cylinder is delivered to a home and replaced (for example, Japanese Utility Model Application Laid-Open No. HEI 4-104). No. 136399, Japanese Utility Model Application 5
-27500).

[0003] However, this method has problems such as aging of delivery staff due to shortage of labor and soaring delivery costs, and the bulk supply method which has been conventionally applied to LP gas for industrial use or automobile use is adopted. (For example, JP-A-59-74091 and JP-A-60-2).
No. 51083). In this bulk supply method, a bulk supply device including a bulk container and various devices installed in a factory or a gas station is filled with LP gas from a bulk truck.

[0004] A gas outlet valve is mounted on the bulk storage tank,
Further downstream, a primary pressure regulator and a secondary pressure regulator are provided. And it is obligated by law that such a bulk supply device be provided with a gas emission preventer when used for consumer use.
The gas emission preventer is designed to shut off the gas passage when the flow rate of LP gas exceeds the specified value due to some abnormality. There is a formula.

FIG. 4 is a cross-sectional view of an external gas emission preventer 1, which is mounted between the above-described gas discharge valve and the primary pressure regulator. In the figure, the right side is the gas inlet 3, the gas inlet 3 is mounted on the gas extraction valve side, and the left side is the gas outlet 5 connected to the primary pressure regulator.

An overflow prevention valve 7 is housed inside.
A valve stem 9 integrated with the overflow prevention valve 7 is guided by a valve guide 11 and can move in the left-right direction.
A spring 15 that presses the overflow prevention valve 7 toward the gas inlet 3 is interposed between the valve guide 11 and a spring receiver 13 provided at the tip of the valve rod 9.

The overflow prevention valve 7 normally has a center line L ₁
As shown in the lower view, it is separated from the valve seat 17,
Thus, the gas flowing from the gas inlet 3 reaches the gas outlet 5. In contrast, when the pressure of the gas inlet portion 3 side becomes gas flow rate specified above exceeds the elastic force of the spring 15, as shown by the upper diagram the center line L _1, excess flow valve 7 valve The passage of gas from the gas inlet 3 to the gas outlet 5 is shut off in close contact with the seat 17.

[0008] To return from the cut-off state to the normal state,
To communicating by-pass passage 19 between upstream and downstream of the excess flow valve 7 for blocking state, a return valve 21, as shown in the right side of FIG center line L _2, by moving upward in the drawing Let open. As a result, the pressure difference between the upstream and downstream of the overflow prevention valve 7 in the shut-off state is eliminated, and the overflow prevention valve 7 is
Moves in a direction away from the valve seat 17 due to the force of. After returning the end of work, as the center line L ₂ shown in FIG left,
The bypass passage 19 is shut off. Reference numeral 23 denotes a cap. After removing the cap 23, the return valve 2
Move 1 up and down.

In the above-described external type, the number of equipment connection parts on the upstream side of the primary pressure regulator, which is a high-pressure part, increases, and this is caused by loosening of screws due to vibration or rapid temperature change. The possibility of gas leakage also increases, leading to a decrease in reliability.In addition, since the gas emission preventer is arranged as a single unit, additional installation space is required and the size of the entire liquefied petroleum gas supply device increases. Invite.

[0010] On the other hand, the one shown in FIG.
This is an example in which 7 is incorporated. The gas release preventing device 27 has the same structure as that shown in FIG. 4, for example, the overflow preventing valve 7 integral with the valve rod 9 blocks the passage of gas in a state of being in close contact with the valve seat 17. . The return operation after the shutoff is performed using the handle 29
To the end.

[0011]

In the conventional liquefied petroleum gas supply apparatus described above, the gas release preventer is provided with a primary pressure regulator regardless of whether the gas release preventer is of an external type or a built-in type. , The internal pressure of the bulk storage tank becomes the inlet pressure of the gas emission preventer, and the inlet pressure constantly fluctuates. For this reason, it is considered that the closing flow rate (the gas flow rate at which the gas is cut off) of the gas release preventer becomes unstable, and the shut-off state at a flow rate less than the specified flow rate in the normal use state is likely to occur. In other words, there is a problem in that a constant closing flow rate cannot be set due to a change in the inlet pressure, which causes malfunction as a gas release preventer and lacks reliability.

Accordingly, an object of the present invention is to suppress the fluctuation of the inlet pressure in the gas emission preventer.

[0013]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a gas storage valve in which a liquefied petroleum gas is stored, and a piping system connected to the gas discharge valve. A primary pressure regulator and a secondary pressure regulator are sequentially provided, and a gas release preventer for blocking the passage of gas at a gas flow rate higher than a specified value is provided on the gas outlet side of the primary pressure regulator.

According to the liquefied petroleum gas supply device having such a configuration, since the gas discharge prevention device is not provided in the high pressure portion on the upstream side of the primary pressure regulator, the connection portion in the high pressure portion is reduced by that much, The medium pressure section between the primary pressure regulator and the secondary pressure regulator has smaller pressure fluctuations than the high pressure section upstream of the primary pressure regulator, and therefore the fluctuations in the inlet pressure of the gas release preventer are small. Become.

According to a second aspect of the present invention, in the configuration of the first aspect of the present invention, the gas emission preventing device has a valve seat provided in a body of a portion forming a gas outlet passage of the primary pressure regulator. An overflow prevention valve accommodating a main body of the container and being able to close the valve seat from the upstream side and block the passage of gas is pressed by elastic means in a direction away from the valve seat.

According to the above configuration, normally, the overflow prevention valve is pressed by the elastic means and is separated from the valve seat, so that the gas is allowed to pass. On the other hand, when the flow rate of the gas is equal to or more than the specified value and the pressure on the upstream side of the overflow prevention valve exceeds the pressing force of the elastic means, the overflow prevention valve is in close contact with the valve seat to block the passage of the gas.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a liquefied petroleum gas supply apparatus showing one embodiment of the present invention. In the liquefied petroleum gas supply device, a gas extraction valve is attached to a bulk storage tank (not shown) as a gas storage unit in a bulk supply system, and a primary pressure regulator 31 and a secondary pressure regulator are connected to a piping system connected to the gas extraction valve. Units 33 are provided sequentially.

The primary pressure regulator 31 has an inlet pipe 39 provided with a gas inlet passage 37 at an end on the right side of the body 35 in the drawing, and the secondary pressure regulator 3 of the body 35.
In the gas outlet passage 41 on the third side, a gas release preventing device 43 is integrally incorporated. The gas release preventing device 43 has the same basic structure and operation as those shown in FIG.

FIG. 2 is an enlarged sectional view of the gas release preventing device 43. A primary outlet pipe 45 as a connecting member is provided at an end of a body 35 of the primary pressure regulator 31.
The primary outlet pipe 45 is fixed to the secondary pressure regulator 33 by a bolt (not shown) using the flange 45 a of the primary outlet pipe 45.

Primary outlet pipe 45 and body 3
5, a gas release preventing device main body 47 is sandwiched and fixed between the first step portion 35a and the gas release preventing device main body 47 and a second step portion 35b within the body 35. Guide 49
Are clamped and fixed. In the valve guide 49, a guide hole 49a penetrating in the left-right direction in the figure is formed.
A valve stem 51 is inserted into 9a so as to be movable in the left-right direction. On the outer peripheral side of the valve guide 49, a plurality of communication passages 49b communicating between the upstream and the downstream are formed.

Primary outlet pipe 45 of valve stem 51
At the end of the side, excess flow valve 53 is provided integrally with, excess flow valve 53, to a valve seat 47a formed in the gas discharge arrestor body 47, the center line L ₁ upper side of FIG. Are moved and displaced between an intimate shut-off state shown by, and a distant open state shown in the lower figure. A spring receiver 55 is attached to the end of the valve rod 51 opposite to the overflow prevention valve 53, and an overflow prevention valve 53 is provided between the spring receiver 55 and the valve guide 49.
A spring 57 as an elastic means for pressing the spring in a direction away from the valve seat 47a is interposed.

A bypass passage 5 is provided between the upstream and downstream of the valve seat 47a.
9 enables communication. Bypass passage 59
Is an upstream communication passage 47 provided in the gas emission preventing device main body 47.
b and a downstream communication path 47c, and an upstream communication path 35c and a downstream communication path 35d provided in the body 35. When the overflow prevention valve 53 is in the shut-off state, the upstream and downstream of the valve seat 47a is communicated by the bypass passage 59, so that the differential pressure between the upstream and downstream of the valve seat 47a is eliminated. It is pushed by the spring 57 to be in an open state.

A return valve 60 is arranged to be openable and closable with respect to the downstream communication passage 35d provided in the body 35.
Return valve 60 is in a state where the center line L ₂ is diagram of the left closed downstream communication passage 35d, and shows a state in which Figure of the right is opened to the downstream side communicating passage 35d.

The return valve 60 is connected to the female thread 6 of the plug 61.
The upper side is screwed into 1 a and can be moved up and down with respect to the plug 61. The plug 61 is screwed into and fixed to an internal thread 35f on the inner periphery of a cylindrical projection 35e formed on the body 35. A cap 63 that covers the return valve 60 and the plug 61 is fitted into the projection 35e.

As shown in FIG. 1, between the body 35 in the primary pressure regulator 31 and the cover 65 attached to the upper opening of the body 35, a pressure reducing chamber 67 on the body 35 side and a large A diaphragm valve 71 that partitions off the pressure chamber 69 is provided. The diaphragm valve 71 is supported at the lower end of the operating rod 73, and a spring receiver 75 is fixed to the upper end of the operating rod 73. A spring 77 that presses the diaphragm valve 71 toward the decompression chamber 67 is interposed between the spring receiver 75 and the diaphragm valve 71.

The lower end of the operating rod 73 is in contact with one end 79a of an operating lever 79. The operation lever 79 is centered on a support pin 81 attached to the body 35 side as shown in FIG.
Inside it can rotate in a plane parallel to the plane of the paper, and the other end 79
One end of the valve stem 83 is in contact with b. The valve stem 83 can move in the left-right direction through a nozzle component member 85 mounted on the pressure reducing chamber 67 side of the inlet pipe 39, and a valve body 87 is provided at the other end. The valve element 87 can open and close the nozzle portion 85a of the nozzle constituent member 85, and is pressed toward the nozzle portion 85a by a spring 89.

In the primary pressure regulator 31 described above, when gas is used in the combustor downstream of the secondary pressure regulator 33 and the pressure in the decompression chamber 67 decreases, the diaphragm valve 71 is pushed by a spring 77. Displaced together with the operating rod 73 toward the decompression chamber 67 side. Along with this, the operation lever 79 rotates counterclockwise to move the valve stem 83 to the right, and separates the valve body 87 from the nozzle portion 85a to open it. Thus, L
P gas flows from the bulk storage tank into the decompression chamber 67 via the gas extraction valve.

When the gas pressure in the pressure reducing chamber 67 becomes higher than a predetermined value, the diaphragm valve 71 resists the force of the spring 77.
Is displaced toward the atmospheric pressure chamber 69, and the valve body 87 is pushed by the spring 89 to move in a direction approaching the nozzle portion 85a by the operation opposite to the above, thereby restricting the gas flow rate. In this way, the pressure in the decompression chamber 67 is adjusted to be always constant.

The secondary pressure regulator 33 includes an outlet pipe 95 having a gas outlet passage 93 on the side of the body 91 opposite to the side on which the primary outlet pipe 45 is mounted.
Is installed. A diaphragm valve 103 is provided between the body 91 and the cover 97 mounted on the upper opening of the body 91 to partition the pressure reducing chamber 99 on the body 91 side and the atmospheric pressure chamber 101 on the cover 97 side.

The diaphragm valve 103 is pressed against the decompression chamber 99 by a spring 107 provided between the diaphragm valve 103 and a spring receiver 105 fixed in the cover 97. An operating rod 10 is provided at the lower center of the diaphragm valve 103.
9 is mounted, and the operating lever 1 is provided below the operating rod 109.
11 are slidably cross engaged. The operation lever 111 includes a support pin 1 whose base end is provided on the body 91 side.
13 and is rotatable about the support pin 113 in a plane parallel to the plane of FIG.

The operation lever 111 has one end side of a valve element 117 connected to a position close to an upper part of the support pin 113 in the drawing via a connection pin 115. The valve element 117 is slidable with respect to a guide portion 91 a formed on the body 91, and the other end is openable and closable with respect to a nozzle portion 45 b formed on the primary outlet pipe 45.

Like the primary pressure regulator 31, the secondary pressure regulator 33 described above uses gas in the combustor downstream of the secondary pressure regulator 33 and reduces the pressure in the decompression chamber 99 when gas is used. The diaphragm valve 103 is pushed by the spring 107 and displaces together with the operating rod 109 toward the decompression chamber 99, whereby the operation lever 111 rotates counterclockwise to rotate the valve body 11
7 is moved to the left to open the nozzle portion 45b, whereby the LP gas is discharged from the bulk storage tank to the primary pressure regulator 31.
, And flows into the decompression chamber 99.

When the gas pressure in the pressure reducing chamber 99 becomes higher than a predetermined value, the diaphragm valve 1 resists the force of the spring 107.
03 is displaced toward the atmospheric pressure chamber 101, and the valve body 117 moves in a direction approaching the nozzle portion 45b by the operation opposite to the above, thereby restricting the gas flow rate. Thus, the decompression chamber 9
The pressure inside 9 is adjusted to be always constant.

Then, in such a gas use state,
When the flow rate of the LP gas becomes equal to or higher than the specified value due to some abnormality, the gas release preventing device 43 operates. That is, the overflow prevention valve 53 in the gas release prevention device 43 is connected to the valve seat 47a.
To prevent the passage of gas from the primary pressure regulator 31 to the secondary pressure regulator 33.

To return from the cut-off state to the normal state,
With the cap 63 removed, the return valve 60 is moved upward, and the pressure difference between the upstream and downstream of the overflow prevention valve 53 is eliminated by the bypass passage 59, whereby the overflow prevention valve 53 is forced by the spring 57. As a result, it moves in a direction away from the valve seat 47a.

According to the liquefied petroleum gas supply apparatus described above, the gas release preventing device 43 is built in the gas outlet passage 41 side of the primary pressure regulator 31, and the primary pressure regulator 3
1 is not arranged in the high-pressure section between the upstream side gas extraction valve, so that the connection portion in the high-pressure section is reduced by that much, and the reliability is improved. As a result, miniaturization is achieved as a whole.

The pressure change in the intermediate pressure section between the primary pressure regulator 31 and the secondary pressure regulator 33 is smaller than that in the high pressure section upstream of the primary pressure regulator 31, so that the gas release is prevented. Fluctuation in the inlet pressure of the gas release device 43 is reduced, the closing flow rate (gas flow rate at which the gas release prevention device 43 is shut off) is stabilized, and malfunction of the gas release prevention device 43 is avoided, thereby improving reliability.

The above-mentioned gas emission preventing device 43 is such that the primary outlet pipe 45 is screwed into the body 35, and the primary outlet pipe 45 is detached from the body 35, whereby the built-in gas emission preventing device 43 is provided. The preventer main body 47, the valve guide 49, the overflow prevention valve 53, and the spring 57 can be removed, and periodic inspection and replacement of the gas release preventer 43 can be easily performed.

FIG. 3 shows another embodiment of the present invention, and is a plan view of a primary pressure regulator 31 having a basic internal structure similar to that of FIG. In this embodiment,
The connection direction of the gas release preventing device 43, which is mounted on the gas outlet passage 41 side of the body 35 of the primary pressure regulator 31 and is similar to that of FIG. 1, is changed so that the gas outlet direction in FIG. ing. However, the secondary pressure regulator 33 is omitted.

That is, the connection direction of the primary outlet pipe 45 with respect to the secondary pressure regulator 33 is changed by 90 degrees on the paper of FIG. 3 with respect to the gas flow direction into the inlet pipe 39 of the primary pressure regulator 31. There is a state.
However, the primary outlet pipe 45 here has a system in which a male screw portion 45c formed on the outer peripheral portion is screwed into the secondary pressure regulator 33 to be fixed. In this case, the gas outlet passage 41 in the body 35 is bent. As described above, by changing the shape of the gas outlet passage 41 and changing the connection direction of the gas release preventing device 43 to the body 35 in accordance with the shape, the connection direction of the secondary pressure regulator can be changed. The change in the connection direction is not limited to the one shown in FIG. 3, and the gas outlet direction may be on the back side of the paper, above or below in FIG. 1.

[0042]

As described above, according to the first aspect of the present invention, the gas release preventing device is not provided in the high pressure section upstream of the primary pressure regulator, but is built in the outlet side of the primary pressure regulator. As a result, the connection portion in the high pressure section is reduced by that much, and the reliability is improved, and the intermediate pressure section between the primary pressure regulator and the secondary pressure regulator is located on the upstream side of the primary pressure regulator. Since the pressure fluctuation is smaller than that of the high-pressure section, the fluctuation of the inlet pressure of the gas release preventer is small, and the malfunction of the gas release preventer can be prevented.

According to the second aspect of the present invention, the flow rate of the gas becomes higher than a specified value, in comparison with the normal state in which the gas is allowed to pass by separating the valve from the valve seat by being pressed by the elastic means. When the pressure on the upstream side of the overflow prevention valve exceeds the pressing force of the elastic means, the overflow prevention valve comes into close contact with the valve seat, so that the passage of gas can be reliably shut off.

[Brief description of the drawings]

FIG. 1 is a sectional view of a liquefied petroleum gas supply device showing one embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a gas emission preventer used in the liquefied petroleum gas supply device of FIG.

FIG. 3 is a plan view showing another embodiment of the present invention, including a partial cross section in which a connection direction of a gas emission preventing device is changed.

FIG. 4 is a cross-sectional view of an external gas release preventing device showing a conventional example.

FIG. 5 is a cross-sectional view of a gas extraction valve having a built-in gas emission preventing device, showing a conventional example.

[Explanation of symbols]

 31 Primary pressure regulator 33 Secondary pressure regulator 35 Body 35a First step 35b Second step 41 Gas outlet passage 43 Gas emission preventer 45 Primary outlet pipe (connecting member) 46 Screw part 47 Gas emission prevention Container body 47a Valve seat 49 Valve guide 51 Valve rod 53 Overflow prevention valve 55 Spring receiver 57 Spring (elastic means)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masaki Yamagishi 23 Minami Kashima, Futamata-cho, Tenryu-shi, Shizuoka Prefecture F-term in Yazaki Keiki Co., Ltd. 3E072 AA01 DA02 GA30

Claims (2)

[Claims] 1. A gas outlet valve is provided in a gas storage portion in which liquefied petroleum gas is stored, and a primary pressure regulator and a secondary pressure regulator are sequentially provided in a piping system connected to the gas discharge valve,
A liquefied petroleum gas supply device characterized in that a gas release preventer for blocking passage of a gas at a gas flow rate higher than a specified value is built in a gas outlet side of the primary pressure regulator. 2. The gas release preventing device according to claim 1, wherein a body of a portion forming a gas outlet passage of the primary pressure regulator accommodates a gas discharge preventing device main body having a valve seat, and is located upstream with respect to the valve seat. An overflow prevention valve that can close off the passage of gas
The liquefied petroleum gas supply device according to claim 1, wherein the liquefied petroleum gas supply device is pressed by an elastic means in a direction away from the valve seat.