JP3215302U - Semi-automatic switching decompressor - Google Patents

Abstract

Provided is a semi-automatic switching pressure reducing device having a structure in which a switching valve and a pressure regulator are integrated so as to eliminate a connecting portion, and even if the intermediate pressure of the semi-automatic switching pressure reducing device is high, no high pressure gas is produced. . In a semi-automatic switching decompression device that enables two gas cylinders to be connected and performs continuous supply by automatically switching the gas supply from the gas cylinder, a variable decompression as a supply-side pressure regulator that can be connected to each of the gas cylinders. A valve 10 and a fixed pressure reducing valve 20 are provided. One of the supply side pressure regulators is selected by the variable pressure reducing valve 10 and gas is guided to the pressure regulator 30 serving as a discharge side pressure regulator, and the discharge side pressure regulation is performed. And the supply side pressure regulator are formed in one housing. [Selection] Figure 1

Description

  The present invention relates to an automatic switching valve that automatically switches gas supplied from a gas supply source (for example, two gas cylinders), and more particularly, semi-automatic that enables continuous supply of a gas having a set adjustment pressure. The present invention relates to a switching pressure reducing device.

  Conventionally, as disclosed in Non-Patent Document 1 and Non-Patent Document 2, three pressure regulators are used as a semi-automatic switching decompression device used in a place where continuous gas supply is required in hospitals and laboratories. A structure in which a (pressure reducing valve) is combined has been proposed.

This semi-automatic switching pressure reducing device includes, for example, a secondary pressure variable pressure reducing valve (variable pressure reducing valve) 110 provided on the front surface side of the housing 100 and a secondary pressure provided on the rear surface side of the housing 100 as shown in FIGS. A pressure fixing pressure reducing valve (fixed pressure reducing valve) 120 and a pressure regulator 140 connected to a common secondary pressure chamber 125 serving as a secondary chamber of each pressure reducing valve via a coupling joint 130 to adjust to an arbitrary pressure. Has been.
A gas cylinder (not shown) is connected to each of the variable pressure reducing valve 110 and the fixed pressure reducing valve 120 via a check valve 150, and the variable pressure reducing valve 110 is urged from the pressure adjustment spring 112 by manual operation of the lever 111. By switching the two, the secondary pressure can be set to two types.

  With the above-described configuration, the gas supplied from the gas cylinder A to the fixed pressure reducing valve 120 on the rear side is reduced to a preset pressure (for example, 1.2 MPa), and the variable pressure reducing valve 110 on the front side is supplied from the gas cylinder B. The supplied gas is depressurized to a pressure set by lever operation. For example, whether the pressure is lower than the pressure set by the fixed pressure reducing valve 120 (for example, 1.1 MPa) or higher than the pressure set by the fixed pressure reducing valve 120 (for example, 1.3 MPa) depending on the position of the lever. Switching to either of these is performed.

  When the secondary pressure of the variable pressure reducing valve 110 is set to a pressure (1.1 MPa) lower than the secondary pressure (1.2 MPa) of the fixed pressure reducing valve 120, the secondary pressure is connected to the fixed pressure reducing valve 110 having a higher secondary pressure. The gas from the gas cylinder A is supplied to the common secondary pressure chamber 125, and the gas decompressed to an arbitrary pressure by the pressure regulator 140 is guided to the outlet joint 131 connected to the secondary chamber of the pressure regulator 140.

  In the gas cylinder, when the gas is released, a secondary pressure set according to the discharge flow rate is lowered, and a phenomenon that the set pressure changes due to a change in the inlet pressure (residual pressure in the cylinder) occurs.

  Therefore, when the remaining amount of the gas cylinder A decreases, the secondary pressure of the fixed pressure reducing valve 120 decreases from 1.2 MPa, and when it becomes lower than 1.1 MPa, the secondary pressure is connected to the variable pressure reducing valve 110 set to 1.1 MPa. The gas from the gas cylinder B thus supplied is supplied to the common secondary pressure chamber 125.

  Then, with the gas from the gas cylinder B being supplied to the common secondary pressure chamber 125, the lever 111 is operated to switch the set pressure, and then the gas cylinder A is replaced with a new gas cylinder AA. At this time, the set pressure of the variable pressure reducing valve 110 becomes 1.3 MPa by the operation of the lever 111. In this state, the supply from the gas cylinder B is continued. When the remaining amount decreases, the secondary pressure of the variable pressure reducing valve 110 decreases from 1.3 MPa, and when the remaining pressure becomes lower than 1.2 MPa, the secondary pressure is set to 1.2 MPa. The gas from the gas cylinder AA connected to the fixed pressure reducing valve 120 is supplied to the common secondary pressure chamber 125, so that the gas can be continuously supplied to the common secondary pressure chamber 125.

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  According to the semi-automatic switching pressure reducing device described above, the variable pressure reducing valve 110 and the fixed pressure reducing valve 120 serving as a switching valve and the pressure regulator 140 have separate structures connected via the coupling joint 130. When the secondary pressure (intermediate pressure) of the valve 110 and the fixed pressure reducing valve 120 is high (1.0 MPa or higher), the high pressure gas is being manufactured, and thus a predetermined high pressure gas manufacturing facility is required. . In order to avoid this, in the conventional semi-automatic switching pressure reducing device, the intermediate pressure does not become high (1.0 MPa or more) by lowering the outlet pressure, which is the secondary pressure of the pressure regulator 140, to 0.55 MPa or less. It corresponded.

  Further, since the variable pressure reducing valve 110, the fixed pressure reducing valve 120, and the pressure regulator 140 are connected via the coupling joint 130, there is a problem that the size of the semi-automatic switching pressure reducing device is increased.

  The present invention has been proposed in view of the above circumstances, and by connecting the switching valve and the pressure regulator as an integral structure, the connection portion is eliminated, and even when the intermediate pressure of the semi-automatic switching pressure reducing device is high, high pressure gas is produced. It is an object to provide a semi-automatic switching pressure reducing device having a structure that does not act.

In order to achieve the above object, a first aspect of the present invention is a semi-automatic switching decompression device that enables a plurality of gas cylinders to be connected and automatically switches the gas supply from the gas cylinders to continuously supply the gas cylinders. Yes.
Supply side pressure regulators (variable pressure reducing valve (10) and fixed pressure reducing valve (20)) connectable to the gas cylinders.
Switching means for selecting one of the supply side pressure regulators and introducing gas to the discharge side pressure regulator (pressure regulator (30)).
And the said discharge side pressure regulator and the said supply side pressure regulator are formed in one housing (1).

Claim 2 is the semi-automatic switching decompression device of claim 1,
The discharge side pressure regulator (pressure regulator (30)) is provided in the center of the housing (1), and the supply side pressure regulator (variable pressure reducing valve (10) and fixed are provided on both sides of the discharge side pressure regulator. Each regulator is arranged linearly by providing a pressure reducing valve (20).

Claim 3 is the semi-automatic switching decompression device of claim 2,
Check valves (inlet joints with check valves (60, 70)) are arranged in the housing (1) outside the supply pressure regulators (variable pressure reducing valve (10) and fixed pressure reducing valve (20)). The outlet joint (80) connected to the discharge side pressure regulator is connectable to the upper surface side of the housing (1).

Claim 4 is the semi-automatic switching pressure reducing device according to claim 1,
One of the supply side pressure regulators has a fixed discharge side pressure (fixed pressure reducing valve (20)), and the other one of the supply side pressure regulators has two stages of biasing force of the pressure adjustment spring (19). The switching means is configured so that the discharge side pressure is variable (variable pressure reducing valve (10)) by switching to.

Claim 5 is the semi-automatic switching pressure reducing device according to claim 4,
The urging force of the pressure adjusting spring (19) of the supply side pressure regulator (variable pressure reducing valve (10)) that makes the discharge side pressure variable is switchable by a lever (41).

Claim 6 is the semi-automatic switching decompression device of claim 5,
The angle between the two switching positions by the lever (41) is 180 degrees.

Claim 7 is the semi-automatic switching pressure reducing device according to claim 6,
The position of the lever (41) is characterized in that it indicates the supply side pressure regulator side supplying the gas.

Claim 8 is the semi-automatic switching pressure reducing device according to claim 4,
The urging force of the pressure adjusting spring (19) can be switched by a rotary handle.

Claim 9 is the semiautomatic switching pressure reducing device according to claim 1,
Each of the supply side pressure regulators is a non-variable pressure regulator.

  According to the semi-automatic switching pressure reducing device of the present invention, by providing three pressure adjusting mechanisms in one housing, it becomes easy to eliminate the connection portion corresponding to the manufacturing action of the high pressure gas, and the pressure regulator (30) The outlet pressure can be supplied up to 0.99 MPa (the last pressure that does not produce high-pressure gas).

  Further, by providing three pressure adjusting mechanisms in one housing, the entire semi-automatic switching pressure reducing device can be reduced in size and weight.

It is front explanatory drawing which shows the semiautomatic switching decompression device which concerns on embodiment of this invention. It is AA 'line sectional explanatory drawing of FIG. It is BB 'line sectional explanatory drawing of FIG. It is sectional explanatory drawing which shows the conventional semiautomatic switching decompression device. FIG. 4 is a cross-sectional explanatory view taken along the line CC ′ of FIG. 3.

An example of an embodiment of the semi-automatic switching decompression device of the present invention will be described with reference to FIGS. 1 to 3.
The semi-automatic switching pressure reducing device is positioned on the left side with respect to one housing 1 and a secondary pressure variable pressure reducing valve (variable pressure reducing valve) 10 which is located on the right side in FIGS. 1 and 2 and serves as a supply side pressure regulator. Secondary pressure fixed pressure reducing valve (fixed pressure reducing valve) 20 serving as a supply side pressure regulator, and a pressure regulator (discharge) for adjusting the gas supplied through the variable pressure reducing valve 10 and the fixed pressure reducing valve 20 to an arbitrary pressure Side pressure regulators) 30 are arranged in a line.

  The variable pressure reducing valve 10, the fixed pressure reducing valve 20 and the pressure regulator 30 include primary chambers 11, 21, 31 and secondary chambers 12, 22, 32 formed in the housing 1, and primary chambers 11, 21, 31. Buffer springs 13, 23, 33 arranged in the inside, adjustment valves 14, 24, 34 urged by the buffer springs, valve seats 15, 25, which partition the primary chamber and the secondary chamber and abut the adjustment valves 35, valve holes 16, 26, and 36 that are opened and closed by the adjustment valve, adjustment valve guides 17, 27, and 37 that guide the adjustment valve, diaphragms 18, 28, and 38 that block the secondary chamber, and pressure applied to the diaphragm The pressure adjusting springs 19, 29, and 39 for adjusting the pressure are provided.

The variable pressure reducing valve 10 is equipped with a handle 40 having a set spring force switching mechanism. The lever 41 connected to the handle 40 is rotated 180 degrees to rotate the handle 40, and the screw 42 is advanced and retracted to move the pressure adjustment spring. 19 is configured such that the urging force that the pressure adjusting spring 19 applies to the diaphragm 18 and the adjusting valve guide 17 can be set in two stages (for example, the set pressure can be set to 1.1 MPa and 1.3 MPa). ing.
Further, the angle between the two switching positions by the lever 41 is set to 180 degrees, so that the lever 41 stops at the horizontal position at the time of switching.

  The fixed pressure reducing valve 20 supplies a gas having a desired secondary pressure (for example, 1.2 MPa) to the secondary chamber 22 by fixing the position of the pressure adjustment spring 29.

  The pressure regulator (pressure reducing valve) 30 loosens the lock nut 50 and moves the adjustment screw 51 forward and backward to press the pressure adjustment spring 39, and the pressure adjustment spring 39 arbitrarily applies the urging force applied to the diaphragm 38 and the adjustment valve guide 37. It is configured to be set to.

The primary pressure chamber 11 side of the variable pressure reducing valve 10 is connected to an inlet joint 60 with a check valve via a flow passage 61 formed in the housing 1. The primary chamber 21 side of the fixed pressure reducing valve 20 is connected to an inlet joint 70 with a check valve via a flow passage 71 formed in the housing 1. The secondary pressure chamber 10 side of the variable pressure reducing valve 10 and the secondary pressure chamber 21 side of the fixed pressure reducing valve 20 are formed with a flow passage (common secondary) formed obliquely in a horizontal plane with respect to the flow passage 61 and the flow passage 71 in the housing 1. Chambers) 81 and 82 are connected to the primary chamber 31 of the pressure regulator 30.
The secondary chamber 32 of the pressure regulator 30 is connected to the outlet joint 80 via a flow passage 83 (FIG. 3) formed in the housing 1 so that gas adjusted to an arbitrary pressure flows out of the housing. ing.

  Pressure gauges 91, 92, 93 are mounted in the flow passages 61, 71, 83 through vertical holes 63, 73, 84, respectively, and the primary pressure of the variable pressure reducing valve 10, the primary pressure of the fixed pressure reducing valve 20, and pressure adjustment The secondary pressure of the vessel 30 is measured.

The variable pressure reducing valve 10 and the fixed pressure reducing valve 20 are constituted by a non-variable pressure regulator. That is, in the housing 1, holes 65 and 75 communicating with the primary chambers 12 and 22 are provided, and cylindrical portions 14 a and 24 a formed by being connected to the adjustment valve are inserted into the holes 65 and 75. 24, the input pressure (primary pressure) acting in the direction of closing the valve is offset. The primary chambers 12 and 22 and the outside are sealed by O-rings 66 and 76.
With this configuration, even when the fluctuation of the input pressure is large due to the connection of the gas cylinder, the fluctuation range of the secondary pressure of the variable pressure reducing valve 10 and the fixed pressure reducing valve 20 can be reduced without increasing the diaphragm diameter. It is possible to reduce the size of the semi-automatic switching pressure reducing device.

  In addition, a safety valve 90 is mounted on the lower surface side of the housing 1 in the primary chamber 31 of the pressure regulator 30 so as to release gas to the outside when the pressure in the primary chamber 31 becomes abnormally high.

  According to each of the pressure reducing valves described above, the adjusting valve guides 17, 27, 37 are pushed by the urging force of the pressure adjusting springs 19, 29, 39, so that the adjusting valves 14, 24, 34 are buffered springs 13, 23, The valve holes 16, 26, and 36 are moved to the center side of the housing 1 against the urging force of 33, and the gas flows from the inlet through the valve holes 16, 26, and 36. To raise.

  When the gas pressure in the decompression chamber becomes higher than the set pressure set by the pressure adjustment springs 19, 29, 39, the diaphragms 18, 28, 38 are pressed against the urging force of the pressure adjustment springs 19, 29, 39. The regulating valve guides 17, 27, and 37 move, the regulating valves 14, 24, and 34 are pushed by the presence of the buffer springs 13, 23, and 33, and the valve seat comes into contact with the valve seats 15, 25, and 35, and the valve hole 16 , 26 and 36 are closed. By repeating such an operation, the reduced pressure chamber is reduced to the set pressure (secondary pressure), and this pressure is maintained.

Next, the operation of the automatic switching pressure reducing device having the above structure will be described.
The pressure regulator 30 is supplied with gas from the gas cylinder via the variable pressure reducing valve 10 or the fixed pressure reducing valve 20, and adjusts the adjusting screw 51 to flow out the gas whose pressure is adjusted to an arbitrary pressure to the outlet joint 80.
In the variable pressure reducing valve 10, the secondary pressure (supply pressure) falls to 1.1 MPa and the lever 41 falls to the right side when the lever 41 is tilted to the left side (the position indicated by the dotted line in FIG. 1). The secondary pressure (supply pressure) is set to 1.3 MPa in the closed state (the position indicated by the solid line in FIG. 1). The fixed pressure reducing valve 20 is set in advance so that the secondary pressure (supply pressure) is 1.2 MPa.
In this state, the lever 41 of the variable pressure reducing valve 10 is tilted to the left, gas cylinders (not shown) are attached to the inlet joints 60 and 70 with check valves of the semi-automatic switching device, and gas is supplied from both sides.

Since the variable pressure reducing valve 10 is in a state where the lever 41 is tilted to the left, the variable pressure reducing valve 10 tries to supply at 1.1 MPa. In this state, the secondary pressure (supply pressure) of the variable pressure reducing valve 10 is 1.1 MPa, and the secondary pressure (supply pressure) of the fixed pressure reducing valve 20 is 1.2 MPa.
Therefore, the flow passages (common secondary chambers) 81 and 82 connected to the primary chamber 31 of the pressure regulator 30 become 1.2 MPa, and the valve hole 16 of the variable pressure reducing valve 10 is closed. Of the gas cylinders connected to the inlet joints 60, 70, the gas from the gas cylinder connected to the fixed pressure reducing valve 20 is reduced in pressure and flows into the common secondary chamber to maintain the set pressure of 1.2 MPa.
That is, when gas cylinders are connected to both sides, there is a differential pressure, so if the supply pressure is to be reduced, gas is supplied from the gas cylinder so that the fixed pressure reducing valve 20 always maintains 1.2 MPa. At this time, no gas is supplied from the gas cylinder connected to the variable pressure reducing valve 10.

  If the gas supply from the gas cylinder connected to the fixed pressure reducing valve 20 is continued and the remaining gas in the gas cylinder is reduced and the supply of gas cannot be maintained as the original pressure decreases, the secondary pressure of the fixed pressure reducing valve 20 is fixed. When 1.2 MPa is interrupted and further falls below 1.1 MPa, gas is supplied from a gas cylinder connected to the variable pressure reducing valve 10 whose set pressure is set to 1.1 MPa. When gas starts to be supplied from the variable pressure reducing valve 10, the gas cylinder on the fixed pressure reducing valve 20 side is almost empty.

  In this state, the lever 41 of the variable pressure reducing valve 10 is reversed to the right side, and the gas cylinder on the fixed pressure reducing valve 20 side is replaced. By reversing the lever 41, the gas from the gas cylinder connected to the variable pressure reducing valve 10 is supplied at 1.3 MPa. The secondary pressure of the fixed pressure reducing valve 20 is fixed at 1.2 MPa.

  When the gas supply from the gas cylinder connected to the variable pressure reducing valve 10 is continued and the residual gas in the gas cylinder decreases, the pressure in the pressure reducing chamber drops below the set pressure and the gas supply cannot be maintained, the variable pressure reducing valve 10 When the next pressure interrupts 1.3 MPa and further falls below 1.2 MPa, gas is supplied from the replaced new gas cylinder on the fixed pressure reducing valve 20 side.

Similarly, when replacing the gas cylinder of the variable pressure reducing valve 10, the cylinder 41 is replaced after the lever 41 is reversed to the opposite side (left side). As a result, the setting of the adjustment pressure returns to the initial state and is supplied from the variable pressure reducing valve 10.
By performing the above-described operation when the gas cylinder is replaced, the gas supply can be continued without causing the pressure regulator 30 to run out of gas.

  According to the configuration of the semi-automatic switching pressure reducing device described above, by providing three pressure reducing valves (pressure adjusting mechanisms) in one housing 1, there is no connection point corresponding to the high pressure gas manufacturing action, and the pressure regulator 30 It becomes possible to supply the outlet pressure up to 0.99 MPa (critical pressure that does not produce high-pressure gas).

  Further, by providing three pressure reducing valves (pressure adjusting mechanisms) in one housing 1, the entire semi-automatic switching pressure reducing device can be reduced in size and weight.

  When the gas is supplied from the gas cylinder connected to the fixed pressure reducing valve 20 provided on the left side with respect to the pressure regulator 30, the lever 41 of the variable pressure reducing valve 10 falls to the left horizontal position, and the pressure regulator 30 When the gas is supplied from the gas cylinder connected to the variable pressure reducing valve 10 provided on the right side, the lever 41 of the variable pressure reducing valve 10 is tilted to the right horizontal position. By instructing the pressure reducing valve (supply side pressure regulator) side, it is possible to easily grasp which side of the gas cylinder as the supply source is the left or right side.

  In the variable pressure reducing valve 10 of the semi-automatic switching pressure reducing device described above, the set pressure is switched according to the position of the lever 41. However, the set pressure may be switched at the rotational position of the circular handle. In this case, the set pressure is switched by rotating the handle by 180 degrees, and an arrow is displayed on the upper surface side of the handle, so that it is possible to instruct which side the gas cylinder as the supply source is on the left or right side. .

DESCRIPTION OF SYMBOLS 1 ... Housing 10 ... Variable pressure reducing valve (supply side pressure regulator)
20 ... Fixed pressure reducing valve (supply side pressure regulator)
30 ... Pressure regulator (discharge side pressure regulator)
11, 21, 31 ... Primary chamber 12, 22, 32 ... Secondary chamber 13, 23, 33 ... Buffer spring 14, 24, 34 ... Adjusting valve 14a, 24a ... Cylindrical portion 15, 25, 35 ... Valve seat 16, 26 , 36 ... Valve hole 17, 27, 37 ... Adjustment valve guide 18, 28, 38 ... Diaphragm 19, 29, 39 ... Pressure adjustment spring 40 ... Handle 41 ... Lever 50 ... Lock nut 51 ... Adjustment screw 60, 70 ... Check Inlet joint with valve 65,75 ... Hole 66,76 ... O-ring 80 ... Outlet joint 90 ... Safety valve

Claims (9)

In a semi-automatic switching decompression device that allows a plurality of gas cylinders to be connected, and performs continuous supply by automatically switching the gas supply from the gas cylinders,
A supply-side pressure regulator connectable to each of the gas cylinders;
Switching means for selecting one of the supply-side pressure regulators and guiding gas to the discharge-side pressure regulator;
A semi-automatic switching pressure reducing device, wherein the discharge side pressure regulator and the supply side pressure regulator are formed in one housing.   2. The semi-automatic system according to claim 1, wherein the discharge side pressure regulator is provided in the center of the housing, and the supply side pressure regulators are provided on both sides of the discharge side pressure regulator, thereby arranging the regulators in a straight line. Switching decompressor.   The semi-automatic switching according to claim 2, wherein a check valve is disposed in a housing outside each of the supply side pressure regulators, and an outlet joint connected to the discharge side pressure regulator is connectable to an upper surface side of the housing. Decompressor.   One of the supply side pressure regulators has a fixed discharge side pressure, and the other one of the supply side pressure regulators has a variable discharge side pressure by switching the urging force of a pressure adjustment spring in two stages. The semi-automatic switching decompression device according to claim 1, which constitutes a switching means.   The semi-automatic switching pressure reducing device according to claim 4, wherein the biasing force of the pressure adjusting spring of the supply side pressure regulator that makes the discharge side pressure variable can be switched by a lever.   The semi-automatic switching decompression device according to claim 5, wherein an angle between the two-stage switching positions by the lever is 180 degrees.   The semi-automatic switching pressure-reducing device according to claim 6, wherein the position of the lever indicates the supply-side pressure regulator that supplies gas.   The semi-automatic switching decompression device according to claim 4, wherein the urging force of the pressure adjusting spring can be switched by a rotary handle.   The semi-automatic switching pressure reducing device according to claim 1, wherein each of the supply-side pressure regulators is constituted by a non-variable pressure regulator.

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