JP2000121405A - Impurity recovery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the operation failure of a pressure adjuster by removing impurity in gas flowing through a gas flow passage. SOLUTION: A gas entrance part 15 of a pressure adjuster is provided with a net filter 19 and an orifice place 21 from the upstream side. Relatively large impurity is removed by the net filter 19. Plural small holes 21a are formed in the circumferential direction in the neighborhood of the outer peripheral part of the orifice plate 21, and gas including impurity is allowed to pass through the small holes 21a. Then, a negative pressure is generated on the surface of the orifice plate 21 in the surrounding of the downstream side of the small holes 21a, and the impurity is involved in this negative load so as to be adhered to the orifice plate 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impurity recovery apparatus for removing impurities contained in a gas flowing through a gas supply passage from a gas supply side containing a liquefied gas.

[0002]

2. Description of the Related Art FIGS. 9 and 10 show a configuration in which gas is supplied from a gas cylinder 1 containing propane gas as a liquefied gas to a combustor 3 such as a gas range. An automatic switching pressure regulator 7 (see FIG. 9) and a single-stage pressure regulator 9 (see FIG. 10) are connected to the gas cylinder 1 via a high-pressure hose 5, and each of the pressure regulators 7 and 9 is A gas meter 13 is connected via a steel pipe 11 and a low-pressure hose 12.

FIG. 11 shows the internal structure of the single-stage pressure regulator 9 described above. Gas inlet 32 and gas outlet 33
A decompression chamber 34 is formed between them. This decompression chamber 3
When the gas pressure in the chamber 4 changes, the diaphragm 39 is vertically displaced in relation to the elastic force of the spring 37 in the atmospheric pressure chamber 35, and this displacement causes the valve 43 to move in the left and right directions via the lever 41. Then, the nozzle unit 45 is opened and closed. As a result, the pressure in the decompression chamber 34 is kept constant, and the gas outlet 3
A constant-pressure gas is supplied to the combustor side via 3.

[0004]

By the way, in the above configuration, when the combustor 3 is ignited and the gas supply is started,
The inside of the gas cylinder 1 is brought into a boiling state, and impurities (such as drain) precipitated at the bottom of the gas cylinder 1 are mixed with a gaseous gas and vaporized, and enter the gas flow path (high-pressure hose 5).
The impurities that have flowed into the gas flow path are separated from the gaseous gas by rapid expansion and contraction of the flow path, and adhere to the valve 43 of the pressure regulator 7 and the valve seat of the nozzle 45. Also in the automatic switching pressure regulator 7 shown in FIG. 9, impurities adhere to the built-in valves and valve seats.

[0005] As described above, impurities adhering to the valves and valve seats of the pressure regulator increase in viscosity due to a decrease in air temperature, hinder opening and closing of the valves, cause malfunctions, and make it impossible to perform a normal pressure regulation function. Cause abnormalities. In particular, recent microcomputer gas meters equipped with a pressure sensor in addition to a flow sensor constantly measure the gas pressure, so when the gas shuts off due to a pressure drop, the valve at the pressure regulator closes when the gas flow stops. Many problems occur, such as abnormal closing pressure of the pump, abnormal regulating pressure in the pressure regulator, and the like.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to remove impurities in a gas flowing in a gas flow path and prevent a malfunction of a pressure regulator.

[0007]

In order to achieve the above object, according to the present invention, a small hole is provided in a gas supply passage in which gas is supplied from a gas supply side containing a liquefied gas to a gas use side. An orifice plate provided with

According to the impurity recovery apparatus having such a configuration, when the gas containing impurities passes through the small holes, the pressure around the small holes on the downstream side of the orifice plate becomes negative, and the impurities having a specific gravity larger than the gas become negative. It gets caught and adheres to the orifice plate around the small hole.

According to a second aspect of the present invention, in the configuration of the first aspect, a mesh-like or porous filter is provided on the upstream side of the orifice plate.

According to the above construction, the filter removes relatively large impurities, and the downstream orifice plate removes the remaining impurities.

According to a third aspect of the present invention, in the configuration of the first or second aspect, the orifice plate is provided upstream of a pressure regulator for reducing high pressure gas on the gas supply side to low pressure gas on the gas use side. ing.

According to the above configuration, the impurities are removed on the upstream side of the pressure regulator, and the adhesion of the impurities to the nozzle portion and the valve seat of the pressure regulator is avoided.

According to a fourth aspect of the present invention, in the configuration of any one of the first to third aspects of the invention, the gas pipe constituting the gas supply passage is formed as a mutually detachable divided body divided into two in the passage length direction. The periphery of the orifice plate was sandwiched and fixed between the divided bodies.

According to the above configuration, the orifice plate is removed by removing the divided bodies from each other, and in this state, the impurities attached to the orifice plate are removed.

According to a fifth aspect of the present invention, in the configuration of the fourth aspect, the gas pipe composed of the two divided bodies is an inlet pipe provided at a gas inlet of the pressure regulator. The filter is held in the upstream split body.

According to the above configuration, the impurities adhering to the filter held by the upstream divided body are removed by removing the divided bodies from each other.

[0017]

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

FIG. 1 is a sectional view of an impurity recovery apparatus according to an embodiment of the present invention. This impurity recovery device,
FIG. 2 similar to that shown in FIG. 11, for example, is disposed between an LP gas cylinder that is a gas supply side that contains a liquefied gas and a combustor such as a gas range that is a gas use side.
The gas inlet 15 is provided as an inlet pipe of a single-stage pressure regulator as shown in FIG.

The above-mentioned impurity recovery device is provided with a filter 19 from the upstream side in the gas supply passage at the gas inlet 15.
And an orifice plate 21 are sequentially installed. The filter 19 has a mesh shape as shown in FIG. 3, and the orifice plate 21 has a plurality of small holes 21a provided on the periphery as shown in FIG. As the filter 19, a porous filter may be used.

The gas inlet section 15 of the pressure regulator comprises a filter housing section 23 on the gas inflow side and an orifice plate housing section 25 on the downstream side.

As shown in a perspective view in FIG. 5, the filter housing portion 23 has a hexagonal nut portion 23a formed on the outer peripheral portion on the gas inflow side and a male screw portion 23 on the distal end side.
b is formed. Also, inside the hex nut part 2
On the 3a side, a female screw portion 23c to which the pipe on the gas cylinder side is screwed and connected is formed, and the female screw portion 23c and the male screw portion 2 are formed.
The filter 19 is accommodated in a step portion 23e between the filter 19 and the passage 23d on the 3b side. This filter 19 is fixed by a C-shaped retaining ring 27 as shown in FIG. 6 fitted on the female screw portion 23c side.

The orifice storage section 25 has a gas inflow side.
A female screw part 25a to which the male screw part 23b of the filter housing part 23 is screwed is formed. This female screw part 25a
The peripheral edge of the orifice plate 21 is clamped and fixed between the step 25b on the downstream side of the filter housing and the distal end surface of the filter housing portion 23. That is, the filter accommodating portion 23 and the orifice plate accommodating portion 25 are detachable divided bodies in which a gas pipe constituting a gas supply passage is divided into two in the longitudinal direction of the passage, and the orifice plate 21 is provided between each divided body. Is pinched and fixed. In addition, the male screw part 23 of the filter storage part 23
An O-ring 29 is interposed between the base-side outer periphery of b and the distal-end inner periphery of the female screw portion 25a of the orifice plate storage portion 25 to seal between them.

The filter accommodating portion 23 is provided with a male screw portion 23b so as to prevent the orifice plate accommodating portion 25 from easily rotating.
An adhesive is applied to a screw connection portion between the female screw portion 25a of the orifice plate storage portion 25 and a locking screw is screwed in from the outer peripheral portion of the female screw portion 25a of the orifice plate storage portion 25, and the tip is inserted into the filter storage portion. 23 male threads 2
3b may be brought into contact with the outer periphery.

Next, the operation will be described. When the combustor is ignited and gas supply is started, drain and the like, which are impurities mixed in the LP gas cylinder, flow into the gas flow path together with the vaporized LP gas and reach the pressure regulator. At the gas inlet section 15 of the pressure regulator, large impurities are first removed by the filter 19 by the gas flowing in. Thereafter, when the gas further reaches the downstream orifice plate 21 and passes through the small hole 21a, a negative pressure is generated on the surface of the orifice plate 21 around the outlet side of the small hole 21a, and as shown in FIG. The impurity 31 having a large diameter is caught by the negative pressure and adheres around the small holes 21a on the surface of the orifice plate 21 to be separated from the gas.

When the clean gas from which the impurities are separated flows into the pressure regulator, the impurities do not adhere to the built-in valves and valve seats, the valves are normally opened and closed, and malfunction of the pressure regulator is avoided. The normal pressure regulation function is exhibited. As a result, even in recent microcomputer gas meters that have a pressure sensor in addition to a flow sensor and constantly measure gas pressure,
Problems such as abnormal closing pressure, abnormal regulating pressure, and gas shutoff due to pressure drop are prevented.

Impurity 31 adhering to orifice plate 21
Is to remove the filter storage section 23 from the orifice plate storage section 25, remove the orifice plate 21, and periodically clean it. In addition, impurities adhering to the filter 19 can be easily cleaned and removed in a state where the filter storage section 23 is removed from the orifice plate storage section 25.

In the above embodiment, the present invention is applied to the gas inlet portion 15 of the single-stage pressure regulator shown in FIG.
As shown in the figure, the present invention is also applicable to an automatic switching pressure regulator having two gas inlets 47, a two-stage pressure reducing pressure regulator, and the like.

[0028]

As described above, according to the first aspect of the present invention, a small hole is provided in the middle of the gas supply passage through which gas is supplied from the gas supply side containing the liquefied gas to the gas use side. Since the orifice plate is provided, when the gas containing impurities passes through the small holes, the surroundings of the small holes on the downstream side of the orifice plate have a negative pressure, and the impurities having a specific gravity larger than the gas are involved in the negative pressure, and the orifice plate around the small holes is reduced. And remove impurities.

According to the second aspect of the present invention, since a mesh-like or porous filter is provided on the upstream side of the orifice plate, a relatively large impurity is removed by the filter, and the remaining impurity is removed by the orifice plate on the downstream side. Thus, impurities can be more reliably removed.

According to the third aspect of the present invention, since the orifice plate is provided on the upstream side of the pressure regulator to remove impurities, adhesion of impurities to the valve of the pressure regulator and the valve seat of the nozzle portion is avoided. As a result, malfunction of the pressure regulator can be prevented.

According to the fourth aspect of the present invention, since the orifice plate has its peripheral edge sandwiched and fixed between the detachable divided bodies obtained by dividing the gas supply passage into two in the passage length direction, the divided bodies are separated from each other. By removing, the orifice plate is removed,
Impurities attached to the orifice plate can be easily removed.

According to the fifth aspect of the present invention, since the filter is held in the upstream divided body in the inlet pipe of the pressure regulator, impurities adhering to the filter are removed by removing the divided bodies. It can be easily removed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an impurity recovery apparatus according to an embodiment of the present invention.

FIG. 2 is a front view of a pressure regulator to which the impurity recovery device of FIG. 1 is applied.

FIG. 3 is a perspective view of a filter used in the impurity recovery device of FIG. 1;

FIG. 4 is a perspective view of an orifice plate used in the impurity recovery device of FIG. 1;

FIG. 5 is a perspective view of a filter storage unit used in the impurity recovery device of FIG. 1;

FIG. 6 is a perspective view of a C-shaped retaining ring for fixing the filter of FIG. 3;

FIG. 7 is an operation explanatory view showing an operation of removing impurities by an orifice plate used in the impurity recovery apparatus of FIG. 1;

FIG. 8 is a front view of an automatic switching pressure regulator to which the impurity recovery device of FIG. 1 is applied.

FIG. 9 is an overall configuration diagram of a general gas supply facility provided with an automatic switching pressure regulator.

FIG. 10 is an overall configuration diagram of a general gas supply facility including a single-stage pressure regulator.

FIG. 11 is a sectional view showing the internal structure of the single-stage pressure regulator of FIG. 10;

[Explanation of symbols]

 15, 47 Gas inlet part (inlet piping) 19 Filter 21 Orifice plate 21a Small hole 23 Filter storage part (divided body) 25 Orifice plate storage part (divided body)

Claims (5)

[Claims] 1. An impurity recovery apparatus comprising: an orifice plate having a small hole provided in a gas supply passage for supplying a gas from a gas supply side containing a liquefied gas to a gas use side. 2. The impurity recovery apparatus according to claim 1, wherein a mesh-like or porous filter is provided upstream of the orifice plate. 3. The impurity recovery apparatus according to claim 1, wherein the orifice plate is provided upstream of a pressure regulator for reducing high pressure gas on the gas supply side to low pressure gas on the gas use side. apparatus. 4. A gas pipe constituting a gas supply passage is formed as a mutually detachable divided body divided into two in a passage length direction,
4. The impurity recovery apparatus according to claim 1, wherein a peripheral edge of the orifice plate is sandwiched and fixed between the divided bodies. 5. A gas pipe composed of two divided bodies,
The impurity recovery device according to claim 4, wherein the inlet pipe is provided at a gas inlet portion of the pressure regulator, and a filter is held in an upstream divided body of the inlet pipe.