KR100665518B1 - A 2-step regulator for reducing gas pressure - Google Patents

Abstract

The present invention relates to a two-stage gas pressure regulator,

A housing 100; A first pressure reducing chamber (200) and a second pressure reducing chamber (300) formed in the housing (100) to be spaced apart from each other in the longitudinal direction, and each having an inlet (110) and an outlet (120); First and second pistons 400 and 600 facing the first pressure reducing chamber 200 and the second pressure reducing chamber 300, respectively; A first spring 500 installed opposite the first pressure reducing chamber 200 of the first piston 400; A second spring 700 installed opposite the second pressure reducing chamber 300 of the second piston 600; A second orifice (180) formed between the first piston (400) and the second piston (600) to be opened and closed according to the movement of each piston; And a first spring chamber 800 in which the first spring 500 is accommodated and in communication with the second pressure reducing chamber 300. The first spring 500 is configured to include a first pressure reduction inside the first piston 400. A first flow passage 410 is formed to connect the seal 200 and the second orifice 180, and the second orifice 180 and the second decompression chamber 300 are formed inside the second piston 600. Since the second flow path 610 to be connected is formed, since the two-stage pressure reduction is configured to be coaxial, the assembly structure is very simple, and a large pressure reduction ratio can be obtained by the two-stage pressure reduction. By applying the pressure on the outlet side to the first spring chamber, the change in the outlet pressure can be immediately acted as a pressure corresponding to the inlet pressure, so that the fluctuation in the outlet pressure can be easily compensated.

Description

Two-stage gas pressure regulator {A 2-STEP REGULATOR FOR REDUCING GAS PRESSURE}

1 is a cross-sectional view showing an example of a conventional gas pressure reducing regulator.

Fig. 2 is a longitudinal sectional view showing the structure of a two-stage gas pressure reducing regulator according to the first embodiment of the present invention.

Fig. 3 is a longitudinal sectional view showing a balance state of loads in the structure of the two-stage gas pressure reducing regulator according to the first embodiment of the present invention.

4 is a longitudinal sectional view showing a pressure distribution in the structure of the two-stage gas pressure reducing regulator according to the first embodiment of the present invention.

FIG. 5A is a longitudinal cross-sectional view showing the flow of gas in the primary piston in FIG. 2. FIG.

FIG. 5B is a longitudinal cross-sectional view showing the flow of gas in the secondary piston in FIG. 2. FIG.

6 is a longitudinal sectional view showing the structure of a two-stage gas pressure reducing regulator according to a second embodiment of the present invention.

※ Explanation of Major Drawings

100 ... housing

200 ... the first decompression chamber

300 ... the second decompression chamber

400 ... First Piston

500 ... 1st spring

600 ... 2nd piston

700 ... 2nd spring

800 ... Spring 1

900 ... Second Spring Room

1000 ... two-stage gas regulator

The present invention relates to a two-stage gas pressure reducing regulator, and more particularly, to a gas pressure reducing regulator for decompressing a gas compressed at a high pressure such as compressed hydrogen gas or natural gas to a predetermined pressure in two stages.

The gas pressure reducing regulator is a device for reducing the high pressure gas pressure formed at the inlet side to a predetermined pressure and supplying it to the outlet side. Conventional gas pressure reducing regulators perform only one-stage pressure reduction, the representative structure of which is disclosed in Korean Utility Model Publication No. 0289663. Hereinafter, a configuration thereof will be described with reference to FIG. 1.

As shown in the drawing, the conventional regulator 10 controls a gas supply port 6 through which gas is supplied from a control valve, a diaphragm 7 that expands and contracts according to inflow and outflow of gas, and an inflow amount of the gas. A pressure regulating screw (8a), a balance spring (8) for pressing the diaphragm (7), and a lever for operating the lowering of the diaphragm (7) to open and close the valve (6a) attached to the gas supply port (6). 9).

First, when the high-pressure fuel is introduced into the interior through the valve 6a provided at the end of the gas supply port 6, the pressure in the decompression chamber is increased, and the diaphragm 7 is raised upward.

In this case, the balance spring 8 provided on the upper surface of the diaphragm 7 is retracted, and the main spring 9a mounted at the lower part of the lever 9 is expanded while the valve 6a formed at the top of the gas supply port 6. ) To close the gas supply.

The gas thus decompressed is discharged through the gas discharge port 10a formed at one side, and the diaphragm 7 is lowered by the elasticity of the balance spring 8 to operate the lever 9 downward to operate the gas supply port 6. The gas starts to be supplied again by opening the valve 6a.

In this manner, the high pressure fuel is reduced to the next stage through the repeated opening and closing of the valve 6a and mixed with air.

However, in the conventional one-stage decompression device, the cross-sectional area of the decompression chamber had to be large and the spring constant of the spring had to be adopted in order to reduce the pressure of a considerable magnitude. In this case, there is a problem that the total volume is increased and the installation cost increases.

In addition, since the pressure is reduced only by the expansion and contraction of the spring and the diaphragm, there is a limit to controlling the fluctuation range of the outlet pressure small according to the large fluctuation of the inlet pressure.

The present invention has been made to solve the above problems, an object of the present invention is to provide a two-stage gas pressure regulator that is provided with a configuration for performing two-stage pressure reduction on the coaxial is simple assembly configuration and can reduce the overall volume. .

Another object of the present invention is to provide a two-stage gas pressure reducing regulator capable of achieving a predetermined outlet pressure having a small fluctuation range by operating actively even if the fluctuation range of the inlet pressure is large.

In addition, another object of the present invention is to provide a regulator for two-stage gas pressure reduction by connecting the outlet pressure to a suitable space to actively respond to the change in the outlet pressure to a pressure corresponding to the inlet pressure.

In order to achieve the above object, the two-stage gas pressure regulator according to the present invention,

A housing;

A first pressure reducing chamber and a second pressure reducing chamber which are formed to be spaced apart from each other in the longitudinal direction in the housing, and each having an inlet and an outlet;

First and second pistons facing the first and second pressure reducing chambers, respectively;

A first spring disposed opposite the first pressure reducing chamber of the first piston;

A second spring disposed opposite the second pressure reducing chamber of the second piston;

A second orifice formed between the first piston and the second piston, the second orifice being opened and closed according to the movement of each piston;

And a first spring chamber in which the first spring is received and in communication with the second pressure reducing chamber.

A first flow path connecting the first pressure reducing chamber and the second orifice is formed in the first piston, and a second flow path connecting the second orifice and the second pressure reducing chamber is formed in the second piston. It is characterized by.

In addition, the two-stage gas pressure regulator according to the present invention,

A housing;

A first pressure reducing chamber and a second pressure reducing chamber which are formed to be spaced apart from each other in the longitudinal direction in the housing, and each having an inlet and an outlet;

First and second pistons facing the first and second pressure reducing chambers, respectively;

A first spring disposed opposite the first pressure reducing chamber of the first piston;

A second spring disposed opposite the second pressure reducing chamber of the second piston;

A first orifice formed between the first pressure reducing chamber and the first piston and opened and closed by a valve;

A second orifice formed between the first piston and the second piston, the second orifice being opened and closed according to the movement of each piston;

A space inside the housing formed by the movement of the first spring, the pressure compensation space communicating with the second pressure reducing chamber;

A space inside the housing formed by the movement of the first spring, the pressure weighting space communicating with the first orifice;

It is configured to include,

A first flow path connecting the pressure weighting space and the second orifice is formed inside the first piston, and a second flow path connecting the second orifice and the second pressure reducing chamber is formed inside the second piston. It is characterized by being.

Here, the space in which the second spring is accommodated is preferably in communication with the atmosphere.

Here, it is preferable that the inlet cap is provided in the first pressure reducing chamber so as to face the first piston in order to adjust the elastic force to the first spring in advance.

In addition, the second pressure reducing chamber is preferably provided with an outlet cap to face the second piston in order to adjust the elastic force to the second spring in advance.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Example 1

2 to 5 show a regulator for pressure reduction according to the present embodiment.

As shown in FIG. 2, the two-stage gas pressure reducing regulator according to the present invention includes a housing 100, a first pressure reducing chamber 200 and a second pressure reducing chamber 300 formed in the housing 100, and The first piston 400 and the first spring 500, the second piston 600 and the second spring 700, the first spring chamber 800 and the second spring chamber 900 is composed of.

First, the outer surface of the housing 100 is cylindrical, but if the shape is extended in the longitudinal direction is not greatly limited in cross-sectional shape. In addition, the housing 100 functions as a frame to allow a plurality of parts to be seated for the pressure reduction function, and the inlet 110 and the outlet 120 are also formed to function as a flow path.

The first pressure reducing chamber 200 is formed to communicate with the inlet 110 in the housing 100. Accordingly, the first decompression chamber 200 is an area where the gas introduced first passes.

Next, the second pressure reducing chamber 300 is formed to communicate with the outlet 120 in the housing 100, and is spaced apart from the first pressure reducing chamber 200 in the longitudinal direction thereof.

The first piston 400 is a component in which the longitudinal movement in the housing 100 is free and the pressure of the first pressure reducing chamber 200 acts on the first pressure reducing chamber 200. 1 is to move along the spring chamber (800).

In addition, a first spring 500 is interposed between the support jaw 140 formed in the housing 100 and the first piston 400. Specifically, the first spring 500 is disposed on the opposite side of the first decompression chamber 200. In addition, a first spring chamber 800 is formed in the housing 100 to accommodate the first spring 500.

On the other hand, the longitudinal movement of the second piston 600 in the housing 100 is freely installed. The second piston 600 faces the second pressure reducing chamber 300 from the rear side and is subjected to the pressure of the second pressure reducing chamber 300.

In addition, a second spring 700 is interposed between the second piston 600 and the housing 100. Specifically, the second spring 700 is disposed on the opposite side of the second decompression chamber 300.

In addition, since the first spring chamber 800 and the second pressure reducing chamber 300 are connected by a communication path 830, the change in the outlet pressure corresponds to the inlet pressure.

In addition, a second spring chamber 900 is formed inside the housing 100 to accommodate the second spring 700. The second spring chamber 900 communicates with the atmosphere and receives atmospheric pressure.

A second orifice 180 is formed between the first piston 400 and the second piston 600 to open and close according to the movement of the respective pistons.

In addition, a first flow path 410 is formed in the first piston 400 to connect the first decompression chamber 200 and the second orifice 180, and inside the second piston 600. A second flow path 610 connecting the second orifice 180 and the second pressure reducing chamber 300 is formed.

On the other hand, the first pressure reducing chamber 200 is provided with an inlet cap 250 to face the first piston 400 in order to adjust the elastic force to the first spring 500 in advance. The inlet cap 250 is installed to be movable along the longitudinal direction of the housing 100. For example, it is preferable that the inlet cap 250 is coupled to the housing 100 through a feed screw or the like to adjust the initial displacement of the first spring 500.

In addition, the second pressure reducing chamber 300 is provided with an outlet cap 350 that serves as a stopper of the second piston 600 and maintains airtightness.

At this time, the outlet cap 350 is installed to be movable along the longitudinal direction of the housing 100 to adjust the initial coupling pressure of the second spring (700). To this end, the outlet cap 350 is coupled to the housing 100 through a transfer screw.

The first spring 500 and the second spring 700 may be a cylindrical coil spring, a square cross-section spring or a disc spring.

In addition, an O-ring 146 is provided between the first piston 400, the second piston 600, and the inner wall of the housing 100 to ensure airtightness.

3 and 4 show the state of the load and pressure distribution acting on the two-stage gas pressure reducing regulator according to the present invention. 5A and 5B show a state in which gas passes through a flow path formed inside the first piston and the second piston.

In the figure, P1 is the inlet pressure, P3 is the final outlet pressure, δ1 is the displacement of the first spring 500, k1 is the spring constant of the first spring, δ2 is the displacement of the second spring 700, k2 is the second spring The spring constant of, A1 is the area of the inlet, A3 is the area of the second piston 600 receiving P3.

In addition, F1 is a force acting on the ball valve 430 for closing the orifice, F2 is a force acting on the first piston 400 in the first spring chamber 800, F3 is due to the final outlet pressure (P3) The force acting on the second piston 600, F4 is the force acting on the second piston 600 in the second spring chamber 700.

Accordingly, the following formula holds.

가 성립하므로 다음의 수식이 성립한다.At this time,

Is true, the following equation holds.

According to the above equation, the following equation holds.

In the above formula, A1, A2, A3, k1, and k2 become one constant when the design is completed, and as the inlet pressure P1 increases, the orifice gap of the second pressure reducing chamber decreases. That is, the pressure control function is operated so that the outlet pressure is constant. Conversely, as the inlet pressure decreases, the orifice gap becomes wider.

In addition, it is possible to set the spring force by adjusting the inlet cap and outlet cap to be a constant outlet pressure.

Therefore, the valve closes when P3 is larger than the predetermined set value and opens when smaller than the set value, so that the outlet pressure P3 converges to a constant pressure.

As a result, when the high-pressure gas is introduced through the inlet 110, the ball valve 430 of the first piston 400 is moved to open the inlet 110. At the same time, as the gap of the second orifice 180 decreases, the pressure of the portion is lowered, thereby performing a one-stage pressure reduction, and then, when the reduced pressure is moved to act on the second piston 600, the two-stage pressure reduction. This is done and the pressure is adjusted uniformly.

Example 2

6 shows the configuration of the pressure reducing regulator according to the present embodiment.

As shown in FIG. 2, the two-stage gas pressure reducing regulator according to the present invention includes a housing 100, a first pressure reducing chamber 200 and a second pressure reducing chamber 300 formed in the housing 100, and The first piston 400 and the first spring 500, the second piston 600 and the second spring 700, the first spring chamber 800 and the second spring chamber 900 is composed of.

The housing 100 has a cylindrical outer surface, but is not particularly limited as long as it extends in the longitudinal direction. The housing 100 serves as a frame to allow a plurality of parts to be seated in order to adjust the decompression function, and the inlet 110 and the outlet 120 are formed to function as a flow path.

The first pressure reducing chamber 200 is formed to communicate with the inlet 110 in the housing 100. Accordingly, the first decompression chamber 200 is an area where the gas introduced first passes.

Next, the second pressure reducing chamber 300 is formed to communicate with the outlet 120 in the housing 100, and is spaced apart from the first pressure reducing chamber 200 in the longitudinal direction thereof.

In addition, the first piston 400 is freely installed in the longitudinal direction within the housing 100. A valve 430 is installed at the front end of the first piston 400.

In addition, a first orifice 170 that is opened and closed by a valve 430 is formed between the first decompression chamber 200 and the first piston 400.

In addition, a first spring 500 is interposed between the support jaw 140 formed in the housing 100 and the first piston 400. Specifically, the first spring 500 is disposed on the opposite side of the first decompression chamber 200. In addition, a first spring chamber 800 is formed in the housing 100 to accommodate the first spring 500. The first spring chamber 800 communicates with the atmosphere and receives atmospheric pressure.

On the other hand, as a space inside the housing 100 formed by the movement of the first spring 500, the pressure compensation space between the first piston 400 and the housing 100 on the opposite side of the first spring 500 850 is in communication with the second decompression chamber 300. Accordingly, the outlet pressure P5 acts on this space.

In addition, as a space inside the housing 100 formed by the movement of the first spring 500, the pressure communicates with the first orifice 170 between the end surface of the first piston 400 and the housing 100. Weighting space 860 is formed.

On the other hand, the longitudinal movement of the second piston 600 in the housing 100 is freely installed. The second piston 600 faces the second pressure reducing chamber 300 from the rear side and is subjected to the pressure of the second pressure reducing chamber 300.

Here, a second spring 700 is interposed between the second piston 600 and the housing 100. Specifically, the second spring 700 is disposed on the opposite side of the second decompression chamber 300.

In addition, a second spring chamber 900 is formed inside the housing 100 to accommodate the second spring 700. The second spring chamber 900 communicates with the atmosphere and receives atmospheric pressure.

In addition, the pressure compensation space 850 and the second pressure reducing chamber 300 is connected by a communication path 830, so that the fluctuation of the outlet pressure corresponds to the inlet pressure.

In addition, a first passage 410 is formed inside the first piston 400 to connect the pressure weighting space 860 and the second orifice 180, and inside the second piston 600. A second flow path 610 connecting the second orifice 180 and the second pressure reducing chamber 300 is formed.

On the other hand, the first pressure reducing chamber 200 is provided with an inlet cap 250 to face the first piston 400 in order to adjust the elastic force to the first spring 500 in advance. The inlet cap 250 is installed to be movable along the longitudinal direction of the housing 100. For example, it is preferable that the inlet cap 250 is coupled to the housing 100 through a feed screw or the like to adjust the initial displacement of the first spring 500.

In addition, the second pressure reducing chamber 300 is provided with an outlet cap 350 that serves as a stopper of the second piston 600 and maintains airtightness.

At this time, the outlet cap 350 is installed to be movable along the longitudinal direction of the housing 100 to adjust the initial coupling pressure of the second spring (700). To this end, the outlet cap 350 is coupled to the housing 100 through a transfer screw.

The first spring 500 and the second spring 700 may be a cylindrical coil spring, a square cross-section spring or a disc spring.

In addition, an O-ring 146 is provided between the first piston 400, the second piston 600, and the inner wall of the housing 100 to ensure airtightness.

Hereinafter, the balance of forces will be described with reference to FIG. 6.

In the figure, P is the pressure of the stage, A is the area, and F is the force, the following relationship holds.

If you combine the above equations,

With reference to this, the operation of the present embodiment is described.

① 1st stage decompression

First, when the inlet pressure (high pressure, P1) is applied, the first valve 430 is pushed to the right, the gap between the first orifice 170 becomes smaller. If a larger pressure is applied, the first spring 500 having a spring constant of k 1 is pushed further and the first orifice 170 is closed. Accordingly, the pressure P2 of the A2 space is reduced, and the first orifice 170 is finely opened while the first valve 430 acts to the left side by the elastic force of the first spring 500. As a result, P1 converges to a constant pressure by compensating the pressure while communicating with the space in which P2 acts.

② 2nd stage decompression

The structure of the two-stage decompression unit is the same as in Example 1.

Here, the inlet pressure of the two-stage decompression unit is P2. That is, when P2 acts, P5 acts on the A5 space to overcome the elastic force of the second spring 700 having the spring constant k2 and act in the direction in which the second valve 440 is closed, while P2 converges to P5 (constant set pressure). do.

At this time, the cross-sectional area of the second valve 4 needs to be very small compared to the A5 area.

According to the present invention having the above-described configuration, since the two-stage pressure reduction is coaxially made, the assembly structure is very simple.

In addition, a large pressure reduction ratio can be obtained by two-stage pressure reduction.

In addition, by applying the pressure on the outlet side to the first spring chamber, the change in the outlet pressure can be immediately acted as a pressure corresponding to the inlet pressure.

Accordingly, the fluctuation of the outlet pressure due to the fluctuation of the inlet pressure can be easily compensated for, and the fluctuation of the outlet pressure can be minimized even if the fluctuation of the inlet pressure is large.

In addition, since the two-stage depressurization is made, a spring having a small spring constant can be employed, and the overall volume can be reduced because the load of each component is reduced.

In addition, the initial setting displacement of the first spring and the second spring can be adjusted through the cap provided at the inlet and outlet, so that the pressure can be easily adjusted.

Claims (5)

A housing 100; A first pressure reducing chamber (200) and a second pressure reducing chamber (300) formed in the housing (100) to be spaced apart from each other in the longitudinal direction, and each having an inlet (110) and an outlet (120); First and second pistons 400 and 600 facing the first pressure reducing chamber 200 and the second pressure reducing chamber 300, respectively; A first spring 500 installed opposite the first pressure reducing chamber 200 of the first piston 400; A second spring 700 installed opposite the second pressure reducing chamber 300 of the second piston 600; A second orifice (180) formed between the first piston (400) and the second piston (600) to be opened and closed according to the movement of each piston; And a first spring chamber 800 in which the first spring 500 is accommodated and in communication with the second pressure reducing chamber 300. A first flow passage 410 is formed inside the first piston 400 to connect the first decompression chamber 200 and the second orifice 180, and a second passage inside the second piston 600. A second stage gas pressure regulator, characterized in that the second passage 610 is formed connecting the orifice 180 and the second pressure reducing chamber (300). A housing 100; A first pressure reducing chamber (200) and a second pressure reducing chamber (300) which are formed to be spaced apart from each other in the longitudinal direction in the housing (100) and have an inlet (110) and an outlet (120), respectively; First and second pistons 400 and 600 facing the first pressure reducing chamber 200 and the second pressure reducing chamber 300, respectively; A first spring 500 installed opposite the first pressure reducing chamber 200 of the first piston 400; A second spring 700 installed opposite the second pressure reducing chamber 300 of the second piston 600; A first orifice (170) formed between the first decompression chamber (200) and the first piston (400) and opened and closed by a valve (430); A second orifice (180) formed between the first piston (400) and the second piston (600) to be opened and closed according to the movement of each piston; A space in the housing 100 formed as the first spring 500 moves, the pressure compensation space 850 communicating with the second pressure reducing chamber 300; A space inside the housing 100 formed as the first spring 500 moves, the pressure weighting space 860 communicating with the first orifice 170; It is configured to include, A first flow passage 410 is formed inside the first piston 400 to connect the pressure weighting space 860 and the second orifice 180, and a second inside the second piston 600. A second stage gas pressure regulator, characterized in that the second passage 610 is formed connecting the orifice 180 and the second pressure reducing chamber (300). The method according to claim 1 or 2, The space for accommodating the second spring 700 is a two-stage gas pressure regulator, characterized in that in communication with the atmosphere. The method of claim 3, Two-stage gas, characterized in that the inlet cap 250 is installed in the first pressure reducing chamber 200 to face the first piston 400 in order to adjust the elastic force to the first spring 500 in advance Pressure Reducing Regulator. The method of claim 3, The second pressure reducing chamber 300 is a two-stage gas, characterized in that the outlet cap 350 is provided to face the second piston 600 in order to adjust the elastic force to the second spring 700 in advance Pressure Reducing Regulator.

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