JP2006052814A - Gas supply system - Google Patents

Abstract

A non-return / safety valve device that is capable of adjusting the operating pressure of a safety valve on the basis of atmospheric pressure while keeping the non-return / safety valve device in a compact manner and does not operate depending on the sunshine conditions for the bulk tank. provide.
A check / safety valve device 20 used in a gas supply system forms a check valve along a central axis of a thick disk 21 and is on an axis perpendicular to a valve rod through hole 24 of the check valve. A safety valve is formed, and the check valve valve chamber 26 and the safety valve valve chamber 27 are communicated with each other by forming a communication hole 30, and a return hole is connected from the discharge valve of the safety valve to the valve rod through hole 24 of the check valve. 29, and the ratio of the discharge nozzle diameter / valve body diameter of the safety valve is reduced so that the operating pressure of the safety valve is not affected by fluctuations in the inlet pressure of the check / safety valve.
[Selection] Figure 1

Description

  The present invention stores liquefied petroleum gas or the like (hereinafter referred to as LPG) in a plurality of bulk tanks, and efficiently consumes the LPG stored in the plurality of bulk tanks by preventing liquid phase movement and liquid sealing. The present invention relates to a gas supply system capable of efficiently delivering and supplying LPG by a tank lorry.

  For efficient delivery of LPG by tank lorry to an LPG supply base where multiple bulk tanks are installed, the liquid phase movement of LPG stored in the bulk tank and the occurrence of liquid seals are prevented to make the LPG smooth. However, in reality, the internal pressure varies depending on the position of the bulk tank between the front and back, and the liquid phase moves from the higher internal pressure to the lower one. Problems such as insufficient management of the remaining amount of LPG for each bulk tank due to liquid phase movement.

  In order to solve the above problem, as shown in FIG. 2, the gas phases of the bulk tanks B1 and B2 are connected to each other by pipes and connected to the gas consumption pipes through the regulators R1 and R2, while the bulk tanks B1 and B2 are connected to each other. The liquid phase is joined and connected to the vaporizer 12, and a check valve is interposed in the previous stage of joining, and a check / safety valve device 10 having a safety valve disposed through a bypass at the entrance and exit of the check valve is provided, The vaporizer 12 is connected to a gas consumption line through a regulator. In addition, the gas consumption pipe is provided with a regulator so that the vaporized gas is supplied at a stable pressure.

Although the LPG supply system has been effective in solving problems such as liquid phase transfer due to the difference between the front and the back, the present applicant has filed Japanese Patent Application 2004 as a compact collection of the check / safety valve devices. -041166 proposed a "check valve and safety valve arranged coaxially".
With the above proposal, the check / safety valve device could be made compact, but due to its structural reasons, the safety valve is opened when the pressure difference between the inlet and outlet exceeds a certain level. In some cases, the pressure difference may exceed a certain level. If this happens, liquid movement occurs and problems such as the occurrence of liquid sealing and the inability to accurately manage the remaining amount of LPG in the bulk tank occur.

  In view of the above-mentioned problems, the present invention is able to adjust the operating pressure of the safety valve on the basis of the atmospheric pressure while keeping the check / safety valve device compact, and does not operate depending on the sunshine conditions for the bulk tank. It is an object to provide a check / safety valve device.

  In order to solve the above problems, the present invention combines the gas phase line that connects the gas phases of a plurality of bulk tanks with each other and the liquid phase line that joins the liquid phases of the bulk tanks together and leads them to the vaporizer. Gas is obtained by joining a gas phase line extending from the vaporizer and a gas phase line connecting the vapor phases of the bulk tank with a check / safety valve device having both a check valve function and a safety valve function in the previous stage. In the gas supply system connected to the consumption line, the check / safety valve device forms a check valve along the central axis of the base, and forms a safety valve on an axis perpendicular to the valve rod through hole of the check valve. The valve chamber of the check valve and the valve chamber of the safety valve are communicated, the discharge nozzle of the safety valve is communicated with the valve rod through-hole of the check valve, and the operating pressure of the safety valve is adjusted to the inlet of the check / safety valve. Unaffected by pressure fluctuation The ratio of the discharge nozzle diameter / valve body diameter of the safety valve is reduced (Claim 1). The check / safety valve has a sliding hole and a counter in which a valve rod sliding piece fits on the central axis of the thick disk. A spring seat, a valve stem through hole, a check valve seat and a valve chamber are connected in series, and on the axis perpendicular to the central axis of the thick disk, the valve chamber, the valve seat and the valve stem of the safety valve A recirculation hole connected to the through hole, a communication hole is formed between the valve chamber of the check valve and the valve chamber of the safety valve, the valve rod sliding piece is formed in the sliding hole, and the sliding hole and the receiving seat are formed. A counter spring is inserted between the valve rod and the valve rod is inserted into the valve rod through hole, a valve body fitted with a valve rubber is loaded into the valve chamber of the check valve, and the male screw at the tip of the valve rod is inserted into the valve body. The valve body is loaded into the valve chamber of the safety valve, and the valve body is urged by an adjustment spring (Claim 2). Preferably, the valve chamber of the check valve is Communication holes for communicating the valve chamber of the serial safety valve, an annular groove is formed in a portion opening at the valve chamber side of the check valve becomes Te (claim 3).

  According to the present invention configured as described above, the safety valve operates on the basis of the atmospheric pressure, and the valve chamber of the check valve and the valve chamber of the safety valve are connected to each other, and the discharge nozzle of the safety valve is reversed. The ratio of the discharge nozzle diameter / valve body diameter of the safety valve is made sufficiently small to communicate with the valve stem through-hole of the stop valve, so that the operating pressure of the safety valve is substantially affected by fluctuations in the pressure on the check / safety valve inlet side due to solar heat. It is not influenced by.

  In addition, the check / safety valve device of the present invention can be installed by simply inserting a gasket between the flanges connecting the pipes and tightening with a clamp bolt and nut, and there is no need to provide a bypass. No special space is required for installation.

  Next, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 2, the gas phases of the plurality of bulk tanks B1 and B2 are connected to each other via regulators R1 and R2, and are connected to a gas consumption line L4 via a gas phase line L1.

  Further, the liquid phases of the bulk tanks B1 and B2 are joined together via the check / safety valve device via the liquid phase line L2 to the vaporizer 12, and the LPG vaporized by the vaporizer 12 passes through the regulator R3. It merges with the gas consumption line L4 via the gas phase line L3 provided. In addition, the regulator R4 is interposed in the gas consumption line L4, and the pressure after joining the gas phase lines L1 and L3 is adjusted.

  The check / safety valve device 20 includes a slide hole 22 for fitting a valve rod slide piece, a counter spring receiving seat 23 and a valve on a central axis of a thick disc 21 whose center portions are raised by grinding the outer side portions on both sides. A rod through hole 24, a check valve seat 25, and a valve chamber 26 are connected to each other.

  On the other hand, a valve chamber 27 of a safety valve, a valve seat 28, and a circulation hole 29 connected to the valve rod through hole 24 are formed on an axis orthogonal to the central axis of the thick disk 21, and the valve chamber of the check valve is formed. A communication hole 30 is provided between the valve 26 and the valve chamber 27 of the safety valve. The four holes H provided in the thick disk 21 are bolt holes for attaching to the flanges at the pipe ends of the liquid phase line.

  The valve rod sliding piece 31 is loaded into the sliding hole 22 and the valve rod 32 integral therewith is passed through the valve rod through hole 24. At this time, the counter spring 33 is connected to the valve rod sliding piece 31 and the receiving seat 23. Load between.

  Instead of loading the counter spring 33 between the valve stem sliding piece 31 and the receiving seat 23 as described above, a receiving seat (not shown) is screwed into the rear end of the valve chamber of the check valve. It is also possible to form a snap ring and mount a counter spring between the receiving seat and the valve body 35.

  A valve body 35 fitted with a valve rubber 34 is loaded into the valve chamber 26 of the check valve, and a male screw 36 at the tip of the valve rod 32 is screwed into a female screw 37 of the valve body 35 so that the safety valve A valve body 39 fitted with an O-ring 38 is loaded into the valve chamber 27, a biasing pressure adjusting spring 40 is loaded behind it, and a biasing pressure adjusting nut 42 is screwed into a female screw 41 above the valve chamber. The rubber packing 43 is fitted on the upper side.

  Further, a communication hole 30 for communicating the valve chamber 26 of the check valve and the valve chamber 27 of the safety valve forms an annular groove 44 in a portion opened on the valve chamber 26 side of the check valve. This is for securing a gas flow path toward the communication hole 30.

  The check / safety valve device 20 configured as described above is installed by simply sandwiching a gasket between the pipe end flanges provided to connect the piping of the liquid phase line L2, and tightening with bolts and nuts. Is completed.

  As described above, according to the present invention, the check valve and the safety valve are incorporated in the thick disk, and the gasket is provided between the flanges integrally provided at the pipe end in order to connect the pipe of the liquid phase line. Installation is completed simply by interposing and tightening with bolts and nuts, and no extra space is required. The operating pressure of the safety valve is based on the atmospheric pressure, and the ratio of the discharge valve diameter / valve body diameter of the safety valve is sufficiently small. It is possible to provide a gas supply system in which the operating pressure of the safety valve is constant within a practical range regardless of fluctuations.

(A) Cross-sectional view of a check / safety valve used in the gas supply system of the present invention, (b) exploded view of the main components Illustration of gas supply system

Explanation of symbols

L1 gas phase line L2 liquid phase line L3 gas phase line (after vaporizer)
L4 Gas consumption line R1, R2, R3, R4 Regulator B1, B2 Bulk tank 12 Vaporizer 20 Check / safety valve device 21 Thick disk 22 Sliding hole 23 Receiving seat (counter spring)
24 Through hole (for valve stem)
25 Valve seat (reverse valve)
26 Valve chamber (check valve)
27 Valve chamber (for safety valve)
28 Valve seat (for safety valve)
29 Recirculation hole 30 Communication hole 31 Valve rod sliding piece 32 Valve rod 33 Counter spring 34 Valve rubber 35 Valve element 36 Male screw (valve rod)
37 Female thread (valve)
38 O-ring 39 Valve body (for safety valve)
40 Energizing pressure adjusting spring 41 Female screw 42 Energizing pressure adjusting nut 43 Rubber packing 44 Annular groove H Bolt hole

Claims (3)

  Both the functions of the check valve and the safety valve at the preceding stage of the gas phase line that connects the gas phases of multiple bulk tanks and the liquid phase line that joins the liquid phases of the bulk tank and leads to the vaporizer In the gas supply system for connecting the gas phase line extending from the vaporizer and the gas phase line connecting the gas phases of the bulk tank to the gas consumption line by interposing a check / safety valve device provided, The stop / safety valve device forms a check valve along the central axis of the base, forms a safety valve on an axis orthogonal to the valve rod through-hole of the check valve, the check valve valve chamber and the safety valve The safety valve discharge nozzle is connected to the check valve through hole of the check valve so that the operating pressure of the safety valve is not affected by fluctuations in the check / safety valve inlet pressure. The ratio of diameter / valve body diameter Gas supply system, characterized in that the fence.   The above-mentioned check / safety valve device has, on the central axis of the thick disk, a sliding hole into which the valve rod sliding piece fits, a receiving seat of the counter spring, a valve rod through hole, a valve seat of the check valve, and a valve chamber. The valve chamber of the safety valve, the valve seat, and the recirculation hole connected to the valve rod through hole are formed on an axis orthogonal to the central axis of the thick disk, and the valve chamber of the check valve and the safety valve A communication hole is formed between the valve chambers, and a valve rod sliding piece is loaded into the sliding hole, a counter spring is loaded between the valve rod sliding piece and the receiving seat, and a valve rod is loaded into the valve rod through hole. Then, a valve body fitted with a valve rubber is loaded into the valve chamber of the check valve, the male screw at the tip of the valve stem is screwed into the female thread of the valve body, and the valve body is loaded into the valve chamber of the safety valve. 2. The gas supply system according to claim 1, wherein the valve body is biased by an adjustment spring.   3. The communication hole for communicating the valve chamber of the check valve and the valve chamber of the safety valve has an annular groove formed in a portion opened on the valve chamber side of the check valve. The gas supply system described.

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