WO2012105356A1

WO2012105356A1 - Pressure regulator

Info

Publication number: WO2012105356A1
Application number: PCT/JP2012/051352
Authority: WO
Inventors: 敏生神戸; 寿坪子; 成司水野; 高橋　正男
Original assignee: 小池酸素工業株式会社
Priority date: 2011-02-02
Filing date: 2012-01-23
Publication date: 2012-08-09
Also published as: TW201303195A; CN103299248A; KR20140002702A; JP2012160102A

Abstract

[Problem] To provide a pressure regulator comprising an adiabatic compression preventing mechanism and a pressure indicating mechanism. [Solution] A pressure regulator (A) comprises an adiabatic compression preventing mechanism (B) and a pressure indicating mechanism (C). The adiabatic compression preventing mechanism (B) comprises: a partitioning member (11) slidably disposed on a stepped part (10) at a primary-side passage (1) of the pressure regulator (A), the partitioning member (11) including a central small flow passage (11a) and a circumferential large flow passage (11f), the large flow passage being blocked when the partitioning member (11) makes contact with the stepped part (10), the partitioning member (11) further including a connection passage (17) formed at a downstream side of an upstream-side end surface (11d) so as to connect the small flow passage and the large flow passage; and a first spring (12) urging the partitioning member toward an upstream side in a gas flow direction. The pressure indicating mechanism (C) comprises: a cylindrical part (31) in which a first relief chamber (31a) having a small diameter and a second relief chamber (32b) having a large diameter are formed with an opening (31d) crossing the second relief chamber; a sliding member (32) including an indicating part (32a) and a pressure receiving part (32b), the sliding member (32) being slidably inserted in the cylindrical part (31); an O-ring (33) disposed on an end part of the first relief chamber; and a second spring (35) urging the sliding member toward the pressure receiving part.

Description

Pressure regulator

The present invention can prevent adiabatic compression that occurs when a primary gas having a high pressure is supplied from a supply source, and indicates whether the pressure of the primary gas is reduced or not supplied without using a pressure gauge. The present invention relates to a pressure regulator obtained.

For example, when a high-pressure gas (high-pressure gas) is supplied to an atmospheric system that has a closed end or a reduced cross-sectional area, the supplied high-pressure gas adiabatically compresses and the temperature rises. Phenomenon occurs. When the high-pressure gas is a gas having a combustion-supporting property such as oxygen, there is a risk of adversely affecting piping, valves, etc. constituting the system due to the temperature rise of the gas.

A typical example of such a system is a pressure regulator. The pressure regulator includes a primary side connection portion connected to a high pressure gas supply source including a gas cylinder and an indoor pipe, a pressure reducing mechanism for reducing pressure of the high pressure gas supplied from the supply source, and a pressure reducing low pressure gas to the secondary A secondary-side connecting portion that connects the secondary-side supplied member in order to supply the secondary-side supplied member.

In the pressure regulator, when the supply of the high pressure gas is started, heat is generated due to the adiabatic compression phenomenon in the space between the decompression mechanism and the primary side connection portion, and the existing gas, the supplied high pressure gas, or A phenomenon occurs in which the temperature of surrounding members rises. In particular, when the supplied high-pressure gas is oxygen and the diaphragm and the sheet member constituting the decompression mechanism are formed of a combustible substance, the heat generated by adiabatic compression adversely affects the diaphragm and the sheet member. There is a fear.

For this reason, an oxygen regulator that does not cause adiabatic compression as disclosed in Patent Document 1 has been proposed. In this oxygen regulator, a sleeve communicating with a high-pressure gas cylinder is provided in the regulator body, and a valve and a coil spring for operating the sleeve are accommodated on the inner surface of the sleeve. A large flow path is formed between them, a small hole at the center is formed as a small flow path, and a valve seat portion that closes the large flow path is formed by the valve. The oxygen regulator configured in this way can prevent adiabatic compression accompanying the supply of high-pressure gas from a supply source, and there is no risk of heating the diaphragm and the sheet member constituting the decompression mechanism, and a safe configuration It can be.

For example, if the supply source of high-pressure gas is a gas cylinder, the amount of gas supplied is limited, so replacement at an appropriate time so as not to hinder the supply of low-pressure gas to the secondary side Is required. For this reason, it is necessary to always check the pressure of the gas cylinder. As a display mechanism for displaying the pressure on the high-pressure gas side in such a pressure regulator, a remaining amount display device disclosed in Patent Document 2 has been proposed.

A remaining amount display device disclosed in Patent Document 2 is a piston that attaches a base portion of a casing having a see-through window to a side surface of a pressure regulator main body, communicates with a gas flow path, and can slide in a base lumen of the casing by gas pressure. Forming a gap for leaking gas in the sliding range of the piston, moving by the gas pressure leaked into the casing, and providing a movable cylinder that shows a certain color surface in the see-through window; Is provided with a degassing valve for discharging the gas in the casing.

In the remaining amount display device, when the remaining amount of the gas cylinder is sufficient, the movable cylinder moves due to the gas flowing into the casing through the gap, and a color surface (green) appears in the see-through window. Next, when the gas vent valve is operated to release the gas flowing into the casing, the movable cylinder moves and a color surface (yellow) appears in the see-through window. When the remaining amount of the gas cylinder is reduced and the gas pressure is reduced, when the piston moves to the base side and passes through the gap, the gas flows into the casing through the gap, and the movable cylinder moves to show red. Even in this case, by operating the gas vent valve to release the gas flowing into the casing, the movable cylinder moves and yellow appears. However, when the operation of the gas vent valve is finished, when the piston moves again and passes through the gap, the gas flows into the casing through the gap, and the movable cylinder moves and green appears. Therefore, regardless of the operation of the gas vent valve, when red appears continuously in the fluoroscopic window, it can be recognized that the remaining amount of the gas cylinder has decreased.

Japanese Utility Model Publication No. 4-19280 Japanese Utility Model Publication No. 58-177698 (No. 57-75592)

In medical institutions, a pressure regulator is attached to a small oxygen cylinder filled with high-pressure oxygen to reduce the pressure, and oxygen reduced to a predetermined pressure is supplied to the patient. When using oxygen for medical purposes, it is necessary to avoid a temperature rise due to adiabatic compression, and it is required to pay close attention when opening the valve of the oxygen cylinder. In addition, medical oxygen cylinders are downsized, and pressure regulators are frequently attached to and detached from oxygen cylinders.

¡Dust and dust may adhere to the connection to the oxygen cylinder while removing the pressure regulator. In the oxygen regulator described in Patent Document 1, dust and dust enter the upstream side of the valve to block the small flow path, and when oxygen is supplied, the oxygen regulator may not flow to the decompression mechanism on the downstream side of the valve. There is.

In addition, it is common to use a Bourdon tube pressure gauge to check the remaining amount of oxygen cylinders, and there is a risk that the pressure regulator will become large and handling will be inconvenient. Furthermore, in the remaining amount display device described in Patent Document 2, it is necessary to operate the gas vent valve when it is attached to a cylinder or when the remaining amount is reduced, which may make the operation complicated. Further, since the gas flowing into the casing is released to the atmosphere along with the operation of the gas vent valve, there is a problem that it cannot be used for any gas.

An object of the present invention is to provide an adiabatic compression prevention mechanism that can prevent adiabatic compression and allow primary gas to circulate even if dust or dust enters, and the primary gas can be brought into the atmosphere without requiring any special operation. It is an object of the present invention to provide a pressure regulator having a pressure indicating mechanism that is not released.

In order to solve the above problems, a pressure regulator according to the present invention includes a primary gas passage connected to a primary gas supply source having a high pressure, and adiabatic compression disposed in the primary gas passage. A prevention mechanism, a pressure indicating mechanism, a secondary side passage through which the secondary gas reduced to a predetermined pressure flows, a pressure reduction mechanism disposed between the primary side passage and the secondary side passage, and the pressure reduction mechanism An adiabatic compression preventive mechanism, wherein the adiabatic compression prevention mechanism slides relative to the stepped portion, and a stepped portion provided in a primary side passage through which a primary gas having a high pressure flows. A small channel having a small cross-sectional area at the center is formed, and a large channel having a large cross-sectional area is formed on the outer periphery, and when the large channel is brought into contact with the stepped portion, the large channel is formed by the stepped portion. Configured to be shielded and upstream end A partition member formed by forming a communication path in which the small flow path and the large flow path are communicated to the downstream side, and the partition member for urging the partition member upstream in the gas flow direction in the primary path. And the pressure indicating mechanism is fixed to the main body of the pressure regulator, and a vacant chamber having a small diameter on the base side and a large diameter on the tip side is formed inside the pressure regulator. A cylindrical body having a plurality of openings formed across a vacant space having a large diameter, an indicator portion, and a pressure receiving portion. The indicator portion has at least two different patterns formed on the outer peripheral surface thereof, and the diameter of the cylindrical body. Is inserted into a large vacant chamber, the pressure receiving part is inserted into the vacant chamber having a small diameter of the cylindrical body, and is slidably inserted into the vacant chamber having a small diameter of the cylindrical body. It is arranged at the end on the large vacant side, the outer periphery is in contact with the inner peripheral surface of the vacant chamber at the arrangement site, and the inner periphery is the aforementioned slide. An O-ring that is in contact with the outer peripheral surface of the shaft portion of the member and prevents leakage of gas in a small-diameter vacant space, and is arranged in the large-diameter vacant chamber of the cylindrical body to urge the sliding member toward the pressure receiving portion And when the primary gas flows into a small-diameter vacant space formed inside the cylindrical body, the sliding member slides according to the pressure of the primary gas, The pattern formed on the outer periphery of the tube is configured to be visible from the opening formed in the cylinder.

In the pressure regulator according to the present invention, since the adiabatic compression prevention mechanism and the pressure indicating mechanism are arranged in the primary side passage through which the primary gas having a high pressure flows, even when dust or dust adheres to the primary side passage, When adiabatic compression can be prevented and the supply source of the primary gas is a gas cylinder, it can be easily determined whether or not the gas cylinder should be replaced.

That is, when the primary gas is supplied to the primary side passage, even if the large flow path formed on the outer periphery of the partition member by the contact of the partition member with the step portion is blocked by the step portion, it is formed on the outer periphery of the partition member. The primary gas that has entered the large flow path flows through the communication path formed on the downstream side of the upstream end face to the central small flow path. Therefore, adiabatic compression does not occur on the downstream side of the partition member. When the pressure on the downstream side of the partition member rises, the partition member is separated from the step portion by the biasing force of the first spring, the large flow path is opened, and a large flow of primary gas flows downstream.

Further, the sliding member constituting the pressure indicating mechanism slides inside the cylindrical body in accordance with the pressure of the primary gas supplied to the primary side passage, and is formed on the outer peripheral surface of the indicating portion along with this sliding. The pattern moves relative to the opening. For this reason, the pattern facing the opening can be visually recognized by monitoring the opening. Therefore, it is possible to recognize whether the primary gas has a sufficiently high pressure or a pressure drop based on the pattern that can be visually recognized through the opening.

Further, the outer periphery of the vacant chamber having a large diameter in the small vacancy formed in the cylindrical body is in contact with the inner peripheral surface of the vacant chamber at the arrangement site, and the inner periphery is a sliding member. It has an O-ring which contacts with the outer peripheral surface of the pressure receiving portion to prevent gas leakage. For this reason, when the primary gas acts on the pressure receiving portion of the sliding member and the sliding member is slid to the pointing portion side, the primary gas may leak from the gap between the pressure receiving portion and the small-diameter empty chamber. Absent.

It is a front view explaining the whole structure of a pressure regulator. It is a figure explaining the structure of a pressure regulator, and is AB sectional drawing of FIG. It is a figure explaining the structure of a pressure regulator, and is CC sectional drawing of FIG. It is a figure explaining the structure of an adiabatic compression prevention mechanism.

A pressure regulator B adiabatic compression prevention mechanism C pressure indicating mechanism D pressure reducing mechanism 1 primary side passage 2 secondary side passage 3 handle 5 body 5a body 5b bonnet 6 mounting member 7 cap nut 10 step portion 10a step end surface 10b inner peripheral surface 11 Partition member 11a Small flow path 11b Small diameter part 11c Large diameter part 11d End face on the upstream side 11e End face on the downstream side 11f Large flow path 12 First spring 13 Housing part 15 Regulation member 15a Hole 16 Filter 17 Hole 18a Nozzle 18b Sheet 19 First No. 3 spring 20 Nozzle pin 21 Spring member 22 Diaphragm 25 Primary side chamber 26 Secondary side chamber 27 Minal 31 Cylindrical body 31a 1st empty room 31b 2nd empty room 31c Sealing room 31d Opening 32 Sliding member 32a Pointing part 32b Pressure receiving part 32c 1st pattern part 32d 2nd pattern part 33 O-ring 34 O-ring holding member 35 2nd Spring

The configuration of the pressure regulator according to the present embodiment will be described with reference to FIGS.

First, the configuration of the pressure regulator A will be briefly described. This pressure regulator A is configured as an oxygen supply device for supplying medical oxygen to a patient, and is attached to and detached from a medical oxygen cylinder (not shown) serving as a primary gas supply source having a high pressure. Installed as possible. The high-pressure oxygen (primary gas) supplied from the oxygen cylinder is decompressed to low-pressure oxygen (secondary gas), and this secondary gas can be supplied to the patient via an oxygen mask or cannula. .

As shown in FIGS. 1 to 3, the pressure regulator A includes a primary side passage 1, an adiabatic compression prevention mechanism B and a pressure indication mechanism C, a secondary side passage 2, a decompression mechanism D, an operation member 3, ,have. The primary side passage 1 is connected to an oxygen cylinder serving as a primary gas supply source, and the primary gas flows through the primary side passage 1. The adiabatic compression preventing mechanism B and the pressure indicating mechanism C are disposed in the primary passage 1. The secondary gas reduced to a predetermined pressure flows through the secondary side passage 2. The decompression mechanism D is disposed between the primary side passage and the secondary side passage. The operation member 3 operates the decompression mechanism D.

The pressure regulator A has a main body 5 composed of a body 5a and a bonnet 5b. A mounting member 6 attached to the discharge port of the oxygen cylinder is fixed to the main body 5. The pressure regulator A can be attached to and detached from the oxygen cylinder using the cap nut 7 fitted with the mounting member 6. A primary-side passage 1 is configured to penetrate the mounting member 6 in the longitudinal direction. An adiabatic compression preventing mechanism B is provided on the free end side (the free end side of the mounting member 6) in the primary passage 1.

As shown in FIGS. 1 and 4, the adiabatic compression prevention mechanism B includes a stepped portion 10, a partition member 11, and a first spring 12. The step portion 10 is formed on the free end side of the primary passage 1. The partition member 11 is slidably disposed on the step portion 10. The first spring 12 urges the partition member 11 upstream in the gas flow direction in the primary passage 1.

The step portion 10 formed on the free end side of the primary passage 1 has a step end surface 10a and an inner peripheral surface 10b. The step end surface 10a is formed with a dimension capable of shielding the large flow path 11f formed on the outer periphery of the partition member 11 when the downstream end surface 11e of the partition member 11 formed in a hexagonal shape comes into contact. ing. The inner peripheral surface 10 b constitutes a large flow path 11 f together with a plane formed on the outer periphery of the partition member 11.

A housing portion 13 for housing the first spring 12 is continuously formed on the main body 5 side of the stepped portion 10. The first spring 12 biases the partition member 11 toward the free end side of the mounting member 6. Furthermore, a hole 15a is provided at the center of the end portion of the primary passage 1 and the defining member 15 is fixed. The hole 15a allows high-pressure oxygen, which is a primary gas filled in an oxygen cylinder, to pass through. The defining member 15 defines the movement limit of the partition member 11 biased by the first spring 12. Further, a filter 16 is disposed so as to cover the step portion 10. The filter 16 is held by the defining member 15.

A small channel 11 a having a small cross-sectional area is formed at the center of the partition member 11. The small flow path 11a is configured by continuously forming a small diameter portion 11b and a large diameter portion 11c. The small diameter part 11b is formed on the upstream end face 11d side. The large diameter portion 11c is formed on the downstream end face 11e side. The diameter of the small diameter part 11b and the diameter of the large diameter part 11c are appropriately set according to the pressure of the primary gas supplied to the pressure regulator A.

The partition member 11 has a substantially hexagonal outer shape, and six gaps formed by a circle (inner peripheral surface 10b of the stepped portion 10) inscribed by the top of the hexagon and six planes are large flow paths. It is comprised so that the function as 11f may be exhibited.

In addition, since the partition member 11 is slidably disposed with respect to the step portion 10 provided in the primary side passage 1, the dimension of the top of the hexagon can smoothly slide with respect to the inner peripheral surface 10 b of the step portion 10. It is configured to ensure smoothness. Further, the dimension between the two opposing planes is formed with a dimension that can be shielded by the step end face 10a of the stepped portion 10.

The hole 17 which comprises a communicating path is formed from the plane which comprises the large flow path 11f of the partition member 11 toward the small diameter part 11b of the small flow path 11a. The hole 17 may be formed through two opposing flat surfaces of the partition member 11 or may be formed in a state of reaching the small diameter portion 11b from one flat surface.

In the adiabatic compression prevention mechanism B, when the primary gas is not supplied, the partition member 11 is disposed on the primary gas supply side by the first spring 12 as shown in FIG. And is kept in this biased state.

When the primary gas is supplied from the above state, the primary gas passes through the filter 16, and the pressure acts on the upstream end surface 11 d of the partition member 11, and the partition member 11 moves downstream against the urging force of the first spring 12. 4b, the downstream end surface 11e abuts on the step end surface 10a of the step portion 10. As shown in FIG. In this state, the large flow path 11f formed by the flat surface of the partition member 11 and the inner peripheral surface 10b of the step portion 10 is shielded by the step end surface 10a.

For example, in the above state, when dust or dust adheres to the upstream end surface 11d of the partition member 11 and the small diameter portion 11b constituting the small flow path 11a is closed, the primary gas supplied through the filter 16 is Then, it flows between the flat surface of the partition member 11 and the inner peripheral surface 10b of the stepped portion 10, and is supplied from the hole 17 formed in the flat surface to the small diameter portion 11b constituting the small flow channel 11a. Then, it flows into the primary passage 1 and is supplied to the nozzle 18a constituting the pressure reducing mechanism D.

As described above, one small-diameter portion 11b and two holes 17 are connected to the small flow path 11a in the partition member 11, and the opening portion in the end surface 11d on the upstream side of the small-diameter portion 11b is debris. Even if the hole 17 is shielded by dust, the primary gas can be supplied to the pressure reducing mechanism D regardless of the above-described problems.

The primary gas flowing into the decompression mechanism D is throttled by the small flow path 11a of the partition member 11, and adiabatic compression in the vicinity of the nozzle 18a and the sheet 18b can be prevented.

When sufficient primary gas is supplied to the decompression mechanism D and the pressure rises, the urging of the partition member 11 by the first spring 12 is restored. At this time, in a state where the decompressed secondary gas is not supplied to the secondary side passage 2, the partition member 11 contacts the filter 16 as shown in FIG. Further, when the decompressed primary gas is supplied to the secondary side passage 2 and a flow of the primary gas is formed in the primary side passage 1, the partition member 11 has a stepped portion as shown in FIG. The position that floats at 10 is held.

The present inventors conducted a measurement experiment on a rise in temperature when primary gas was supplied using a pressure regulator having an adiabatic compression prevention mechanism B and a pressure regulator having no adiabatic compression prevention mechanism. went. The pressure of the primary gas was 13.5 MPa, and the solenoid valve was opened so that it could be supplied to the adiabatic compression prevention mechanism B. The temperature measurement position was the outer peripheral surface of the step portion 10 in the mounting member 6.

As a result of the above experiment, in the case of the pressure regulator having the adiabatic compression prevention mechanism B, the temperature before measurement was about 20 ° C., but the temperature after 0.1 seconds after supplying the primary gas was about 80 ° C., 0 The temperature after 2 seconds was about 90 ° C., and the temperature after 0.4 seconds was about 80 ° C.

In the case of a pressure regulator that does not have the adiabatic compression prevention mechanism B, the temperature before measurement was about 20 ° C., but the temperature after 0.1 seconds after supplying the primary gas was about 200 ° C., 0.2 ° C. The temperature after 100 seconds was about 100 ° C., and the temperature after 0.4 seconds was about 80 ° C.

As is clear from the above experiment, in the pressure regulator having the adiabatic compression prevention mechanism B, when a primary gas having a high pressure is supplied, it is possible to prevent adiabatic compression and suppress a temperature rise.

Next, the configuration of the decompression mechanism D will be briefly described. As shown in FIG. 2, a decompression mechanism D that decompresses the primary gas that has passed through the primary passage 1 is configured inside the main body 5. The pressure reducing mechanism D in this embodiment does not have a special structure, and is configured in the same manner as a pressure regulator that is generally commercially available.

That is, the decompression mechanism D includes the nozzle 18a formed in the main body 5, the sheet 18b configured to be separated from or approachable to the nozzle 18a, and the third biasing the sheet 18b in the direction of closing the nozzle 18a. A spring 19, a nozzle pin 20 that moves the seat 18 b, a spring member 21 that expands and contracts with the operation of the handle 3 that is an operation member, and a diaphragm 22 that is biased by the spring member 21 and moves the nozzle pin 20. It is configured.

In the above-described configuration, the primary side chamber 25 is formed on the upstream side of the primary passage 1 with the nozzle 18a as a boundary, and the third spring 19 is accommodated in the upstream side. The downstream side of the secondary passage 2 is formed on the downstream side. A secondary side chamber 26 that forms the upper end and through which the decompressed gas flows is formed.

The secondary side passage 2 is formed continuously to the secondary side chamber 26, and a terminal 27 for attaching hoses for supplying the decompressed secondary gas to the supply portion is provided in the secondary side passage 2. The terminal is fixed to the main body 5 while being arranged.

Next, the configuration of the pressure indicating mechanism C will be described. As shown in FIG. 3, the pressure indicating mechanism C has a function of indicating the pressure acting on the primary passage 1 of the pressure regulator, that is, the pressure of the primary gas.

The pressure indicating mechanism C includes a cylindrical body 31, a sliding member 32, an O-ring 33, an O-ring pressing member 34, and a second spring 35. The cylinder 31 is connected to the primary side chamber 25 and fixed to the main body 5. The primary side chamber 25 is formed at the end of the primary side passage 1 formed in the main body 5 of the pressure regulator. The sliding member 32 is slidably inserted into the cylindrical body 31. The O-ring 33 prevents the gas flowing into the cylinder 31 from leaking to the atmosphere. The O-ring pressing member 34 presses the O-ring 33. The second spring 35 biases the sliding member 32.

Inside the cylindrical body 31, a first vacancy 31a that is a vacant with a small diameter and a second vacancy 31b that is a vacant with a large diameter are formed. A seal chamber 31c is formed at a site where the first vacant chamber 31a and the second vacant chamber 31b are connected. A plurality of openings 31d are formed through the outer peripheral surface of the cylindrical body 31 and the second empty chamber 31b in a portion corresponding to the substantially central portion in the length direction of the second empty chamber 31b on the distal end side of the cylindrical body 31. Is formed.

The sliding member 32 includes an instruction portion 32a and a pressure receiving portion 32b. The instruction portion 32a is inserted into the second empty chamber 31b of the cylindrical body 31, and the pressure receiving portion 32b is inserted into the first empty chamber 31a and slides in the longitudinal direction, whereby the sliding member 32 reciprocates. A first pattern portion 32c is formed on the distal end side of the outer peripheral surface of the instruction portion 32a, and a second pattern portion 32d is formed at a position separated from the first pattern portion 32c.

The first pattern portion 32c and the second pattern portion 32d are configured as clearly different patterns (for example, different knurled patterns or different colors). The first pattern portion 32c is formed so as to be opposed to the opening 31d of the cylindrical body 31 in a state where the sliding member 32 is not slid (a state where no pressure is applied to the pressure receiving portion 32b). A second pattern portion 32d is formed so that the member 32 can face the opening 31d when sliding against the urging force of the second spring 35.

The O-ring 33 is accommodated in a seal chamber 31c formed in the cylindrical body 31, and the outer peripheral surface is in contact with the inner peripheral surface of the vacant chamber at the arrangement site, that is, the inner peripheral surface of the seal chamber 31c. The surface is in contact with the outer peripheral surface of the pressure receiving portion 32 a of the sliding member 32. For this reason, even if the primary gas having a high pressure flows into the first vacant space 31a of the cylindrical body 31, it is possible to prevent the leakage of the primary gas to the atmosphere.

The O-ring pressing member 34 has a function of preventing the O-ring 33 housed in the seal chamber 31c from dropping off. For this reason, the O-ring pressing member 34 is constituted by a member having a hole having a diameter capable of penetrating the pressure receiving portion 32a of the sliding member 32 at the center.

The second spring 35 is disposed between the top of the cylindrical body 31 and the pointing portion 32b of the sliding member 32, and biases them in a direction away from each other, thereby causing the sliding member 32 to act in the direction of primary gas action. It is energizing in the opposite direction. The spring constant of the second spring 35 is set corresponding to a limit pressure that interferes with the supply of the secondary gas when the supply pressure of the primary gas decreases. Therefore, a different spring constant is set for the second spring 35 depending on the target gas.

In the pressure indicating mechanism C, when the primary gas is not supplied to the primary side passage 1, the opening 31d of the cylindrical body 31 has a first pattern formed on the outer peripheral surface on the front end side of the indicating portion 32a of the sliding member 32. 32c is opposed and visually recognized. When the valve of the supply source is opened, the primary gas having a high pressure is supplied, and the primary side passage 1 and the primary side chamber 25 are filled with the primary gas.

The primary gas flowing into the primary side chamber 25 acts on the pressure receiving portion 32b of the sliding member 32 constituting the pressure indicating mechanism C, and slides the sliding member 32 against the urging force of the second spring 35. . As the sliding member 32 slides, the second pattern 32d formed on the outer peripheral surface of the pointing portion 32a is visually recognized facing the opening 31d of the cylindrical body 31.

At this time, the primary gas that has flowed into the first empty chamber 31a of the cylindrical body 31 is prevented from flowing into the second empty chamber 31b by the O-ring 33. For this reason, the primary gas does not leak to the atmosphere through the pressure indicating mechanism C.

Thereafter, the secondary gas decompressed by operating the handle 3 as described above is supplied to the target supply destination, and the secondary gas is consumed.

When the pressure of the oxygen cylinder decreases as the consumption amount of the secondary gas decreases, the pressure receiving portion 32b slides on the sliding member 32, and along with this sliding, the pattern facing the opening 31d of the cylindrical body 31 appears. The second pattern 32d changes to the first pattern 32c. That is, when the primary gas pressure is sufficiently high, the pattern visible through the opening 31d is the second pattern 32d, and the ratio of the second pattern 32d to the opening 31d decreases as the primary gas pressure decreases. As it becomes smaller, the first pattern 32c can be visually recognized.

Therefore, it is possible to indicate the pressure of the primary gas by a change in the pattern visually recognized from the opening 31d, that is, a change in the ratio between the second pattern 32d and the first pattern 32c. The approximate pressure of the primary gas can be recognized by visually recognizing the ratio of the first pattern 32c and the second pattern 32d through the opening 31d.

After recognizing the pressure of the primary gas by the pressure indicating mechanism C as described above, it is possible to replace the oxygen cylinder as necessary.

In the pressure regulator according to the present invention, it is possible to prevent adiabatic compression when a primary gas having a high pressure is supplied from a supply source, and it is possible to reduce the pressure even when dust or dust adheres. The secondary gas can be supplied stably. For this reason, for example, it can be advantageously used as an oxygen supply device used in a hospital or as an industrial pressure regulator.

Also, since the structure is simple, the volume is small, and the primary gas does not leak into the atmosphere, any gas such as a combustion-supporting gas, a combustible gas, or an inert gas can be used.

Claims

A primary side passage through which the primary gas flows and which is connected to a supply source of a primary gas having a high pressure; an adiabatic compression prevention mechanism and a pressure indicating mechanism disposed in the primary side passage; and a second pressure reduced to a predetermined pressure. A pressure regulator having a secondary side passage through which a secondary gas circulates, a pressure reducing mechanism disposed between the primary side passage and the secondary side passage, and an operation member for operating the pressure reducing mechanism,
The adiabatic compression prevention mechanism is
A step portion provided in a primary passage through which a primary gas having a high pressure flows,
When slidably arranged with respect to the stepped portion, forming a small flow path with a small cross-sectional area at the center and forming a large flow path with a large cross-sectional area on the outer periphery and contacting the stepped part A partition member configured such that the large flow path is shielded by the stepped portion, and a communication path is formed downstream of the upstream end face so as to communicate the small flow path and the large flow path. ,
A first spring that biases the partition member upstream in the gas flow direction in the primary passage;
Comprising
And the pressure indicating mechanism comprises:
A cylinder that is fixed to the body of the pressure regulator, and in which a vacant chamber having a small diameter on the base side and a large diameter on the tip side is formed, and a plurality of openings are formed across the vacant chamber having the large diameter; ,
It consists of an instruction part and a pressure receiving part, and the instruction part is inserted into a vacant room in which at least two different patterns are formed on the outer peripheral surface and the diameter of the cylindrical body is large, and the pressure receiving part is a vacant room with a small diameter of the cylindrical body A sliding member inserted in and slidable,
The cylindrical body is disposed at the end of the vacant chamber having a large diameter in the vacant chamber having a small diameter, the outer periphery is in contact with the inner peripheral surface of the vacant chamber at the arrangement site, and the inner periphery is the sliding member. An O-ring that contacts the outer peripheral surface of the pressure-receiving portion and prevents leakage of gas in a vacant space having a small diameter;
A second spring disposed in an empty chamber having a large diameter of the cylindrical body and biasing the sliding member toward the pressure receiving portion;
When the primary gas flows into a small-diameter vacant space formed inside the cylindrical body, the sliding member slides according to the pressure of the primary gas and is formed on the outer periphery of the indicating portion Is configured to be visible from an opening formed in the cylindrical body.