Semi-automatic switching device

Abstract

To provide a semi-automatic switching device having two pressure reducing valves, both of which are structured as variably switched valves.SOLUTION: In a semi-automatic switching device, a plurality of gas cylinders can be connected; a body has supply-side pressure regulators 10, 40 that can be connected to the respective gas cylinders, and also has switching means that selects one of the supply-side pressure regulators and leads gas to a discharge-side pressure regulator 2; and gas supply from the gas cylinders is automatically switched to perform continuous supply. The switching means includes: a first gear 32 configured to move forward and backward so as to be able to press a pressure adjustment spring 20 of one supply-side pressure regulator 10; a second gear 52 having the same diameter as that of the first gear 32 and configured to move forward and backward so as to be able to press the pressure adjustment spring 20 of the other supply-side pressure regulator 40; and a switching gear 70 fixed to the main body so as to mesh between the first gear 32 and the second gear 52.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an automatic switching valve that automatically switches between gases supplied from gas supply sources (e.g., two gas cylinders), and in particular to a semi-automatic switching device that continuously supplies gas from each gas cylinder by manually switching the biasing force of a pressure adjustment spring in a supply-side pressure regulator connected to the gas cylinder. [Background technology]

[0002] Conventionally, in places such as hospitals and laboratories where a continuous supply of gas is required, a system has been used in which a discharge pressure regulator is connected to a semi-automatic switching device connected to a pair of supply pressure regulators, thereby continuously supplying gas at a constant pressure.

[0003] As shown in Figures 7 and 8, this system is configured with a secondary pressure variable pressure reducing valve (variable pressure reducing valve) 120 and a secondary pressure fixed pressure reducing valve (fixed pressure reducing valve) 130 provided in a housing 110, a semi-automatic switching device 100 provided with a common secondary pressure chamber 140 that serves as the secondary chamber of each pressure reducing valve, and a pressure regulator 200 that is connected to the common secondary pressure chamber of the semi-automatic switching device and adjusts the pressure to any desired level. A gas cylinder (not shown) is connected to the variable pressure reducing valve 120 and the fixed pressure reducing valve 130 of the semi-automatic switching device via a check valve 150, and the variable pressure reducing valve 120 is configured to be able to set two types of secondary pressure by manually operating a lever 121 to switch the biasing force from a pressure adjusting spring 122 to a pressure adjusting valve 123.

[0004] With the above-described configuration, the gas supplied from the gas cylinder (side A) to the fixed pressure reducing valve 130 is reduced to a preset pressure (for example, 1.2 MPa), and the gas supplied from the gas cylinder (side B) to the variable pressure reducing valve 120 is reduced to a pressure set by operating the lever. For example, depending on the position of the lever 121, the pressure can be switched to either a pressure lower than the pressure set in the fixed pressure reducing valve 130 (for example, 1.0 MPa) or a pressure higher than the pressure set in the fixed pressure reducing valve 130 (for example, 1.4 MPa).

[0005] When the secondary pressure of variable pressure reducing valve 120 is set to a pressure (1.0 MPa) lower than the secondary pressure (1.2 MPa) of fixed pressure reducing valve 130, gas from the gas cylinder (side A) connected to fixed pressure reducing valve 130 with a higher secondary pressure is supplied to common secondary pressure chamber 140, and the gas is reduced to an arbitrary pressure by pressure regulator 200 and flows out (FIG. 7).

[0006] In a gas cylinder, when gas is released, the secondary pressure set according to the release flow rate drops, and the set pressure also changes due to changes in the inlet pressure (residual pressure in the cylinder).

[0007] Therefore, when the remaining amount of gas in the gas cylinder (side A) decreases, the secondary pressure of the fixed pressure reducing valve 130 decreases from 1.2 MPa, and when it falls below 1.0 MPa, gas from the gas cylinder (side B) connected to the variable pressure reducing valve 120, whose secondary pressure is set to 1.0 MPa, is supplied to the common secondary pressure chamber 140 (Figure 8).

[0008] Then, with gas being supplied from the gas cylinder (side B) to the common secondary pressure chamber 140, the lever 121 is operated to switch the set pressure, and the gas cylinder (side A) is replaced with a new gas cylinder. At this time, the set pressure of the variable pressure reducing valve 120 becomes 1.4 MPa by operating the lever 121. In this state, supply from the gas cylinder (side B) continues, and as the remaining amount decreases, the secondary pressure of the variable pressure reducing valve 120 drops from 1.4 MPa. When it drops below 1.2 MPa, gas from the gas cylinder (side A) connected to the fixed pressure reducing valve 130, whose secondary pressure is set to 1.2 MPa, is supplied to the common secondary pressure chamber 140, thereby enabling a continuous supply of gas from the common secondary pressure chamber 140 to the pressure regulator 200. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Utility Model Registration No. 3215302 Summary of the Invention [Problem to be solved by the invention]

[0010] According to the semi-automatic switching device described above, the pressure reduction value of the variable pressure reducing valve 120 needs to be set above and below the 1.2 MPa fixed pressure reducing valve 130, and the switching range (1.0 to 1.4 MPa) tends to be large. On the other hand, when the pressure reduction value of the variable pressure reducing valve 120 or the fixed pressure reducing valve 130 reaches a high pressure (1.0 MPa), this becomes a high-pressure gas production act, and therefore requires specified production equipment.

[0011] When the switching range of the variable pressure reducing valve 120 (0.4 MPa in the above example) is large, if the pressure reduction values ​​of the variable pressure reducing valve 120 and the fixed pressure reducing valve 130 are kept below a high pressure (1.0 MPa), there is a problem that the finally obtained discharge side pressure decreases.

[0012] The present invention has been proposed in view of the above-mentioned circumstances, and aims to provide a semi-automatic switching device in which each of the two pressure reducing valves in the semi-automatic switching pressure device is a variable switching valve, so that the pressure reduction value can be set to less than 1.0 MP while the discharge side pressure can be set high. [Means for solving the problem]

[0013] In order to achieve the above object, claim 1 provides a semi-automatic switching device that can be connected to a plurality of gas cylinders, has supply-side pressure regulators (10, 40) that can be connected to each of the gas cylinders, and has switching means in its main body that selects one of the supply-side pressure regulators and directs the gas to a discharge-side pressure regulator (2), and automatically switches the gas supply from the gas cylinders to provide continuous supply, and is characterized by including the following configuration. The switching means a first gear (32) that moves back and forth so as to be able to press the pressure adjustment spring (20) of one of the supply-side pressure regulators (10); a second gear (52) having the same diameter as the first gear (32) and moving back and forth so as to be able to press the pressure adjusting spring (20) of the other supply-side pressure regulator (40); a switching gear (70) fixed to the main body so as to mesh between the first gear (32) and the second gear (52); Equipped with. Furthermore, a lever (74) is provided on the upper part of the switching gear (70), and the supply-side pressure regulator is switched by rotating the lever (74). At the start and end positions of the rotation of the lever (74) given by rotating the lever (74) 180 degrees, the tip position of the lever coincides with the selected side (high-pressure adjustment side) of the supply-side pressure regulator (10, 40).

[0014] Claim 2 provides the semi-automatic switching device of claim 1, The switching gear (70) is composed of a pair of gears (switching gear 70 and transmission gear 80) having the same diameter as the first gear (32) and the second gear (52), and the forward and backward movement of the first gear is achieved by rotating in the same direction as the switching gear, and the forward and backward movement of the second gear is achieved by rotating in the opposite direction to the switching gear.

[0015] Claim 3 provides the semi-automatic switching device of claim 1, The switching gear (large diameter switching gear 85) is composed of a single gear with a larger diameter than the first gear (32) and the second gear (52), and the forward and backward movements of the first gear and the second gear are characterized in that upward and downward movements are obtained by rotating in the same direction. [Effects of the Invention]

[0018] According to the semi-automatic switching device of the present invention, by providing the first gear (32) and the second gear (52) meshed with the switching gear (70), the first gear and the second gear rotate in the direction of adjusting (increasing or weakening) the biasing force of the pressure adjustment spring (20) of the supply-side pressure regulator in response to the rotation of the switching gear, and the secondary pressure values ​​(reduced pressure values) of the supply-side pressure regulators (10, 40) can be changed simultaneously. As a result, a structure in which a variable switching valve is used can be adopted for both supply side pressure regulators, and a semi-automatic switching device with a narrow pressure value range can be realized.

[0019] By configuring the switching gear as a pair of gears (switching gear 70 and transmission gear 80) having the same diameter as the first gear (32) and the second gear (52), the first gear (32) and the second gear (52) rotate in opposite directions relative to the rotation of the switching gear (70).

[0020] By configuring the switching gear as a single gear (large diameter switching gear 85) having a larger diameter than the first gear (32) and the second gear (52), the first gear (32) and the second gear (52) rotate in the same direction in response to the rotation of the switching gear. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a front view illustrating a semi-automatic switching device according to an embodiment of the present invention; [Figure 2] FIG. 2 is an explanatory side view of the semi-automatic switching device of FIG. [Figure 3] FIG. 2 is an explanatory cross-sectional view taken along line III-III in FIG. [Figure 4] 4(a) and (b) are front explanatory views of the gear portion of the semi-automatic switching device of FIG. 3 when switching. [Figure 5] 10 is a cross-sectional explanatory view corresponding to FIG. 3, showing another embodiment of the semi-automatic switching device. FIG. [Figure 6] 6(a) and 6(b) are front explanatory views of the gear portion of the semi-automatic switching device of FIG. 5 when switching. [Figure 7] FIG. 1 is a model diagram showing a conventional semi-automatic switching pressure reducing device. [Figure 8] FIG. 1 is a model diagram showing a conventional semi-automatic switching pressure reducing device. DETAILED DESCRIPTION OF THE INVENTION

[0022] An embodiment of a semi-automatic switching pressure reducing device including a semi-automatic switching device of the present invention will be described with reference to FIGS. 1 to 3. FIG. As shown in Figures 1 and 2, the semi-automatic switching pressure reducing device is composed of a semi-automatic switching device 1 equipped with two supply-side pressure regulators (pressure reducing valves) 10, 40 and a switching device 100 that switches between the two supply-side pressure regulators 10, 40, and a discharge-side pressure regulator (pressure reducing valve) 2 that is connected to the common secondary pressure chamber of the supply-side pressure regulators 10, 40 and adjusts the pressure to any desired level. Gas is supplied to each of the supply-side pressure regulators (pressure reducing valves) 10 and 40 via an inlet joint 7 .

[0023] Pressure gauges 3, 4, and 5 are attached to the primary pressure chamber side of the supply side pressure regulators (pressure reducing valves) 10 and 40 and the primary pressure chamber side of the pressure regulator (pressure reducing valve) 2, respectively, to measure the primary pressure of the supply side pressure regulator (pressure reducing valve) 10, the primary pressure of the supply side pressure regulator (pressure reducing valve) 40, and the secondary pressure of the discharge side pressure regulator 2.

[0024] Furthermore, a safety valve 6 is attached to the primary chamber of the supply-side pressure regulator 10 so as to release gas to the outside if the pressure in the primary chamber becomes abnormally high.

[0025] Each supply-side pressure regulator 10 has a primary pressure chamber 12 and a common secondary pressure chamber 13 formed in a housing 11, and is also equipped with a buffer spring 14 arranged in the primary pressure chamber 12, a regulating valve 15 biased by the buffer spring, a valve seat 16 that separates the primary pressure chamber 12 and the common secondary pressure chamber 13 and against which the regulating valve 15 abuts, a valve hole 17 that is opened and closed by the regulating valve 15, a regulating valve guide 18 that guides the regulating valve 15, a diaphragm 19 that blocks the common secondary pressure chamber 13, and a pressure regulating spring 20 that adjusts the pressing force on the diaphragm 19.

[0026] A cover part 21 is fixed to the housing 11 so as to cover the pressure adjustment spring 20, and a screw support part 23 is fixed to a central hole 22 of the cover part 21. A screw thread is cut in the center of the screw support part 23, and the shaft part 31 of the handle part 30 is screwed onto the screw thread, so that the lower end of the shaft part 31 is positioned to abut against the upper end of the pressure adjustment spring 20. With this configuration, when the handle portion 30 is rotated, the shaft portion 31 moves up and down relative to the screw support portion 23, pressing against the pressure adjustment spring 20 and varying the biasing force, and the adjustment valve 15 moves closer to and away from the valve hole 17 depending on the position of the diaphragm 19, thereby acting to reduce the pressure in the common secondary pressure chamber 13 to the set secondary pressure.

[0027] The handle portion 30 of the supply-side pressure regulator 10 is composed of a shaft portion 31 and a first gear 32 fixed to the shaft portion 31. The portion of the lower part of the shaft portion 31 that screws into the screw support portion 23 is formed with a right-handed screw thread 31a that moves downward with clockwise rotation, and is arranged so as to be able to advance and retreat relative to the screw groove 24 engraved in the screw support portion 23. The first gear 32 is configured to include a gear 32a having an upper large diameter portion with recesses and projections formed on the periphery of the side surface.

[0028] The supply side pressure regulator 40 has a similar configuration to the supply side pressure regulator 10, and includes a second gear 52 and a gear 52a fixed to a shaft portion 51 of a handle portion 50 corresponding to the handle portion 30.

[0029] Each supply-side pressure regulator 10, 40 is disposed on a flat plate 60, and a cubic lid 61 is attached to cover the entire regulator. A switching gear 70 is rotatably attached to a support frame 62 attached to the flat plate 60, and this switching gear 70 is disposed so as to mesh with the second gear 52 of the supply-side pressure regulator 40. A shaft portion 71 of the switching gear 70 passes through the lid 61, and a cylindrical portion 73 is attached to the upper end, with a long switching lever 74 installed on the side.

[0030] The switching gear 70 is arranged so as to mesh with a transmission gear 80 fixed to the support frame 62 , and the first gear 32 of the supply-side pressure regulator 10 is arranged so as to mesh with the transmission gear 80 . The gear connection section is made up of four gears, and the diameters of the first gear 32, second gear 52, switch gear 70, and transmission gear 80 are all formed to the same length as shown in FIG. 4, and the rotation angle given to the switch gear 70 is directly given to the first gear 32 and second gear 52.

[0031] In this case, the rotation direction of the first gear 32 relative to the rotation direction of the switching gear 70 is opposite to the rotation direction of the second gear 52, so when the shaft portion 31 of the first gear 32 moves downward in a clockwise direction (right-handed thread), the shaft portion 51 of the second gear 52 can move upward in a counterclockwise direction, making it possible to use supply side pressure regulators 10, 40 whose screw support portions 23 for the shaft portions 31, 51 have the same structure (right-handed thread).

[0032] Each supply-side pressure regulator 10, 40 is configured so that the pressure in the secondary pressure chamber can be set to either 0.85 MPa or 0.99 MPa by adjusting the pressing force on the adjustment spring 20 by moving the shaft portion 31, 51 (screw) back and forth as the switching gear 70 rotates 180 degrees, thereby changing the biasing force applied to the diaphragm 19 and the adjustment valve guide 18 in two stages. The switching lever 74 stops on the line connecting the inlet joint 7 when switching is complete.

[0033] That is, Figure 3 shows the state in which the switching lever 74 of the switching gear 70 is operated to the right position (the lower diagram in Figure 4). In this state, the first gear 32 is positioned below and the second gear 52 is positioned above the vertical positions of the switching gear 70 and the transmission gear 80, so that the shaft portion 31 of the first gear 32 increases the pressing force on the adjustment spring 20, thereby increasing the biasing force applied to the diaphragm 19, and the secondary pressure chamber of the supply side pressure regulator 10 is set to 0.99 MPa. On the other hand, in the supply side pressure regulator 40, the second gear 52 is positioned upward, which releases pressure on the adjustment spring 20, thereby reducing the force applied to the diaphragm 19, and the secondary pressure chamber of the supply side pressure regulator 40 is set to 0.85 MPa.

[0034] A gas cylinder is connected to the primary pressure chamber 12 of each of the supply-side pressure regulators 10, 40 via an inlet fitting 90 (inlet fitting 7) with a check valve. The common secondary pressure chamber 13 of the supply-side pressure regulator 10 and the common secondary pressure chamber 13 of the supply-side pressure regulator 40 are connected via a vertical hole 11a drilled in the housing 11 and a fitting 81, and gas flows from a connecting hole 82 provided on one of the fittings 81 to the discharge-side pressure regulator 2. The pressure regulator (discharge side pressure regulator) 2 adjusts the pressure of the gas supplied from the common secondary pressure chamber 13 to a preset arbitrary pressure and discharges it to the outside.

[0035] In each of the supply-side pressure regulators 10, 40 described above, the regulating valve guide 18 is pushed by the biasing force of the pressure regulating spring 20, causing the regulating valve 15 to move downward in the housing 11 against the biasing force of the buffer spring 14, opening the valve hole 17, and allowing gas to flow from the inlet through the valve hole 17, increasing the pressure in the secondary pressure chamber (decompression chamber) 13.

[0036] When the gas pressure in the secondary pressure chamber (decompression chamber) 13 becomes higher than the set pressure set by the pressure adjustment spring 20, the diaphragm 19 is pressed, causing the adjustment valve guide 18 to move against the biasing force of the pressure adjustment spring 20, and the buffer spring 14 pushes the adjustment valve 15, causing the valve seat to abut against the valve seat 16 and closing the valve hole 17. By repeating this operation, the secondary pressure chamber (decompression chamber) 13 is decompressed to the set pressure (secondary pressure), and this pressure is maintained.

[0037] Next, the operation of the semi-automatic switching device 1 having the above structure will be described. The discharge side pressure regulator 2 receives gas from a gas cylinder attached to the inlet fitting 7 via the supply side pressure regulator 10 or the supply side pressure regulator 40, and discharges the gas, which has been reduced and adjusted to a desired pressure, to the outlet fitting 8 (Figure 1).

[0038] As shown in Figure 3, when a gas cylinder is connected to each check valve-equipped inlet joint 90 (inlet joint 7) of the supply side pressure regulators 10, 40 of the semi-automatic switching device 1, when the lever 74 of the semi-automatic switching device is positioned on the right side (Figures 1 and 3), the first gear 32 is positioned below the switching gear 70 and presses the adjustment spring 20, so the secondary pressure (supply pressure) of the supply side pressure regulator 10 is set to 0.99 MPa, and the secondary pressure (supply pressure) of the supply side pressure regulator 40 is set to 0.85 MPa.

[0039] In this state, the flow passage (common secondary pressure chamber) connected to the primary pressure chamber 13 of the supply-side pressure regulator 10 becomes 0.99 MPa, the valve hole 17 of the supply-side pressure regulator 40 is closed, and gas flows in from the gas cylinder connected to the supply-side pressure regulator 10, which has a high secondary pressure set, and flows into the common secondary pressure chamber 13, maintaining the set pressure of 0.99 MPa. In other words, when gas cylinders are connected to both sides, if the supply pressure attempts to drop due to a pressure difference, gas is supplied from the gas cylinder so that the pressure is always maintained at 0.99 MPa by supply-side pressure regulator 10. At this time, gas is not supplied from the gas cylinder connected to supply-side pressure regulator 40. The gas decompressed by the supply-side pressure regulator 10 flows from the joint 81 through the communication passage 82 to the discharge-side pressure regulator 2, and the gas decompressed from 0.99 MPa to the desired pressure flows out from the outlet joint 7.

[0040] As gas continues to be supplied from the gas cylinder connected to supply-side pressure regulator 10, the remaining gas in the gas cylinder decreases and the source pressure drops, and as the gas supply cannot be maintained, the secondary pressure of supply-side pressure regulator 10 falls below 0.99 MPa, and when it further drops below 0.85 MPa, gas is supplied from the gas cylinder connected to supply-side pressure regulator 40, whose set pressure is set to 0.85 MPa. When gas begins to be supplied from supply-side pressure regulator 40, the gas cylinder on the supply-side pressure regulator 10 side is almost empty.

[0041] In this state, lever 74 of supply-side pressure regulator 10 is rotated 180 degrees to the left to replace the gas cylinder on the supply-side pressure regulator 10 side. By rotating lever 74, first gear 32 moves up and second gear 52 moves down, causing shaft 51 of second gear 52 to increase the pressing force on adjustment spring 20, increasing the biasing force applied to diaphragm 19, and setting secondary pressure chamber 13 of supply-side pressure regulator 40 to 0.99 MPa.

[0042] As gas continues to be supplied from the gas cylinder connected to the supply-side pressure regulator 40, the remaining gas in the gas cylinder decreases, and the pressure in the secondary pressure chamber (decompression chamber) 13 drops below the set pressure until the gas supply can no longer be maintained. When the secondary pressure of the supply-side pressure regulator 40 falls below 0.99 MPa and further drops below 0.85 MPa, gas is supplied from the new gas cylinder that has been replaced on the supply-side pressure regulator 10 side.

[0043] When replacing the gas cylinder of the supply-side pressure regulator 40, the lever 74 is also turned to the opposite side (right side) before replacing the cylinder. As a result, the adjusted pressure setting returns to the initial state, and gas is supplied from the supply-side pressure regulator 10. By carrying out the above-described procedure when replacing the gas cylinder, the supply of gas to the discharge pressure regulator 2 can be continued automatically (semi-automatically) by simply switching the lever 74 without causing the gas to run out.

[0044] According to the above-described embodiment, the secondary pressure of the supply side pressure regulators 10, 40 is switched between 0.85 MPa and 0.99 MPa, so that a semi-automatic switching device can be realized with a smaller switching range of pressure values ​​than conventional devices. As a result, it is possible to suppress the secondary pressure (reduced pressure value) of the supply side pressure regulators 10, 40 to 0.85 MPa or 0.99 MPa (less than 1.0 MPa), while making the final discharge side pressure a relatively high pressure value (0.85 MPa or more).

[0045] FIG. 5 shows another embodiment, and parts that adopt the same configuration as in FIGS. 1 to 4 are given the same reference numerals and detailed explanations thereof will be omitted. In this example, the gear coupling portion is made up of three gears, and a large diameter switching gear 85 having a larger diameter than the first gear 32 and the second gear 52 is disposed in the center and used. When the large diameter switching gear 85 is rotated, the rotation direction of the first gear 32 and the rotation direction of the second gear 52 become the same direction (opposite direction to the large diameter switching gear 85), so the screw groove 33 engraved on the shaft portion 31 of the first gear 32 and the screw groove 24 of the screw support portion 23 move downward in a clockwise direction (right-handed screw), and the screw groove 53 engraved on the shaft portion 51 of the second gear 52 and the screw groove 26 of the screw support portion 25 move upward in a clockwise direction (left-handed screw).

[0046] According to this example, by reducing the number of gears in the gear connection portion, the supply side pressure regulator 10 and the supply side pressure regulator 40 can be arranged closer to each other compared to the semi-automatic switching device shown in Figures 1 to 3, and the entire semi-automatic switching device can be made compact.

[0047] In addition, in each of the above-described embodiments, the gear coupling portion has three or four gears, but may be configured with more gears.

[0048] According to the configuration of the semi-automatic switching pressure reducing device of the present invention, a variable switching valve structure can be adopted for both of the two pressure reducing valves (supply side pressure regulators) in the semi-automatic switching pressure reducing device, thereby realizing a semi-automatic switching device with a narrow switching range for pressure values. [Explanation of symbols]

[0049] 1...Semi-automatic switching device 2...Discharge side pressure regulator (pressure reducing valve) 3, 4, 5... Pressure gauge 6...Safety valve 7...Inlet fitting 8...Outlet fitting 10, 40... Supply side pressure regulator (pressure reducing valve) 11. Housing 12...Primary pressure chamber 13...Common secondary pressure chamber 14...Buffer spring 15...Regulating valve 16...Valve seat 17...Valve orifice 18...Adjusting valve guide 19...Diaphragm 20...Pressure adjustment spring 21...Cover part 23...Screw support 24...Thread groove (right-hand thread) 25...Screw support 26...Thread groove (left-hand thread) 30...Handle 31...Shaft section 32...First gear 33...Thread groove (right-hand thread) 50...Handle 51...Shaft section 52...Second gear 53...Thread groove (left-hand thread) 60...Flat plate 61...lid body 62...Support frame 70...Switching gear 73...Cylindrical part 74...Lever 80...Transmission gear 85...Large diameter switching gear 90...Inlet fitting with check valve 100...Switching device

Claims

1. A semi-automatic switching device that can be connected to a plurality of gas cylinders, has supply-side pressure regulators that can be connected to each of the gas cylinders, and a switching means that selects one of the supply-side pressure regulators and directs gas to a discharge-side pressure regulator, and automatically switches the gas supply from the gas cylinders to perform continuous supply, The switching means a first gear that moves back and forth so as to be able to press a pressure adjustment spring of one of the supply-side pressure regulators; a second gear having the same diameter as the first gear and moving back and forth so as to be able to press the pressure adjustment spring of the other supply-side pressure regulator; a switching gear fixed to the body so as to mesh between the first gear and the second gear; A lever is provided on the upper part of the switching gear, and the supply side pressure regulator is switched by rotating the lever. At the start and end positions of the lever rotation given by the 180-degree rotation operation of the lever, the tip position of the lever coincides with the selected side of the supply-side pressure regulator. A semi-automatic switching device characterized by:

2. 2. The semi-automatic switching device according to claim 1, wherein the switching gear is composed of a pair of gears having the same diameter as the first gear and the second gear, and the forward and backward movement of the first gear is achieved by rotating in the same direction as the switching gear, and the forward and backward movement of the second gear is achieved by rotating in the opposite direction to the switching gear.

3. 2. The semi-automatic switching device according to claim 1, wherein the switching gear is composed of a single gear having a diameter larger than that of the first gear and the second gear, and the forward and backward movements of the first gear and the second gear are achieved by rotating them in the same direction, thereby achieving upward and downward movements.

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