KR20090128597A - Regulator - Google Patents

Abstract

PURPOSE: A regulator is provided to prevent operability degradation and damage due to temperature decrease caused by pressure reduction. CONSTITUTION: A regulator comprises a first pressure reduction part(100) and a second pressure reduction part(200). The first pressure reduction part comprises a first housing, a first valve shaft, a piston, a first cap, and a first spring. The first housing has a first orifice to which the first valve shaft is connected. The piston contacts with one end of the first valve shaft. The first cap is coupled with the first housing to cover the end in which the piston is installed. The first spring is connected between the piston and the first cap. The second pressure reduction part comprises a second housing, a second valve shaft, a diaphragm, a second cap, and a second spring. The diaphragm contacts with one end of the second valve shaft.

Description

Regulator {REGULATOR}

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

The 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 flows into the inside through the valve 6a provided at the end of the gas supply port 6, the pressure in the pressure reducing 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 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.

In addition, in the case of gas, since the temperature decreases rapidly during decompression, the diaphragm formed of rubber has a problem in that an icing occurs due to a temperature decrease due to material properties, resulting in a decrease in operability and a risk of breakage.

The present invention has been made to solve the above-mentioned conventional problems, an object of the present invention is to provide a regulator that can achieve a predetermined outlet pressure by performing a two-stage pressure reduction to facilitate the fine pressure and flow rate control .

In addition, another object of the present invention is to provide a regulator for preventing the risk of operability degradation and breakage caused by the temperature drop generated during the decompression of the gas.

The present invention for achieving the above object, in the regulator for reducing the fuel introduced into the input port to discharge to the output port, a first housing formed with a first orifice, and a first combined with the first orifice A first cap coupled to the first housing to cover an end portion of the valve shaft, a piston contacting one end of the first valve shaft, and an end portion at which the piston is installed, and coupled between the piston and the first cap. A first housing coupled to a first direction of the first pressure reducing unit and the first housing and having a second orifice formed therein; a second valve shaft coupled to the second orifice; and the second valve shaft. A diaphragm which is in contact with one end of the diaphragm for tip motion, a second cap coupled to the second housing so as to cover an end portion of the diaphragm installed between the diaphragm and the diaphragm and the second cap; It is characterized by including second pressure reducing unit consisting of a second spring.

Here, the first housing is provided with a shaft support to surround the outer circumferential surface of the first valve shaft, the shaft support is formed with one or more inlet holes.

In addition, a shaft spring is installed between the first valve shaft and the shaft support.

In addition, a first passage is formed in the first housing so as to communicate with the first orifice, a stopper is formed between the first passage and the piston, and a pair of communicating with the first passage is formed in the first housing. A second flow path is formed, a flow preventing groove is formed between the pair of second flow paths, and the insertion valve corresponding to the flow preventing groove is formed in the second valve shaft.

In addition, the seat is formed on the surface facing the second orifice of the second valve shaft.

In addition, the inside of the second cap is further provided with a guide that is in close contact with the diaphragm while surrounding the second spring.

On the other hand, the first decompression unit is further provided with a hot water port and hot water flow path.

In addition, the first housing is formed with an air port in communication with the upper end of the piston.

The first cap and the second cap are further provided with adjustment screws.

In addition, the first decompression unit is further provided with a shut off valve.

In addition, the first pressure reducing unit is further provided with a pressure sensor.

On the other hand, the first pressure reducing portion is further provided with a relief valve.

According to the regulator according to the present invention, by performing a two-stage pressure reduction it is easy to control the minute pressure and flow rate provides an effect that can achieve a predetermined outlet pressure.

In addition, the application of the piston provides an effect of preventing the risk of operation degradation and breakage caused by the temperature decrease generated during the decompression of the gas.

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

In addition, since the initial setting displacement of the first spring and the second spring can be adjusted, the pressure can be easily adjusted.

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

First, referring to the drawings will be described in the CNG vehicle as follows.

2 is a diagram schematically showing a general CN engine vehicle.

As illustrated in FIG. 2, the CNG vehicle of the present invention includes a cylinder 21 storing compressed natural gas, a fuel supply line 23 connecting the cylinder 21 and the engine 22, and the fuel. It is composed of a regulator (A) installed in the supply line (23) for reducing the compressed natural gas, and a mixer (24) for mixing the compressed natural gas and the intake air compressed by the regulator (A) to supply to the engine.

In addition, the cylinder 21 is stored in the compressed natural gas at a pressure of approximately 350Bar, the compressed natural gas is maintained at approximately 2 ~ 5Bar at 350Bar while passing through the regulator (A) before being supplied to the engine 22 To reduce the pressure.

In addition, the mixer 24 is provided with an air cleaner 25 to remove foreign substances in the intake air, the foreign matters that are hindered in the combustion of the engine 22 by the air cleaner 25 is removed to prevent engine relief. do.

Here, the engine 22, regulator A, mixer 24, and air cleaner 25 are controlled by a main control device such as an ECU.

Accordingly, the mixer in which the compressed natural gas and the intake air are combined by the mixer 24 is injected into each combustion chamber of the engine 22 to perform combustion, and the harmful exhaust gas generated by the combustion is discharged to the outside.

Hereinafter, the regulator will be described in detail with reference to the drawings.

3A to 3C are perspective views illustrating a regulator according to the present invention, FIG. 4 is a plan view illustrating a regulator according to the present invention, FIG. 5 is a sectional view taken along the line 'A-A' of FIG. 4, and FIG. 5 is a sectional view taken along the line 'B-B' of FIG. 5, and FIG. 7 is a sectional view taken along the line 'C-C' of FIG.

As shown in FIGS. 3A to 7, the regulator A according to the present invention includes a first pressure reducing unit 100 for reducing the gas first and a gas passing through the first pressure reducing unit 100. The second pressure reducing part 200 is configured to reduce the differential pressure, and the operation directions of the first pressure reducing part 100 and the second pressure reducing part 200 are configured to be perpendicular to each other.

The first decompression unit 100 may include a first housing 110 in which a first orifice 111 is formed, a first valve shaft 120 coupled to the first orifice 111, and the first first orifice 111. A piston 130 which is in contact with one end of the valve shaft 120 to the front end movement, and the first cap 140 and the piston coupled to the first housing 110 to cover the end portion of the piston 130 is installed The first spring 150 is coupled between the 130 and the first cap 130.

In addition, the second decompression unit 200 is coupled to the second housing 210 and the second orifice 211 in which the second orifice 211 is formed and coupled in the vertical direction of the first housing 110. The second valve shaft 220, the diaphragm 230 that comes into contact with one end of the second valve shaft 220 to perform a tip movement, and the second housing 210 to cover an end portion at which the diaphragm 230 is installed. It is composed of a second cap 240 is coupled to the second spring 250 is installed between the diaphragm 230 and the second cap 240.

In addition, the first housing 110 is provided with an input port 112 through which gas is introduced, and the second housing 210 is provided with an output port 212 through which the decompressed gas is discharged. A filter 112a is installed at 112 to filter foreign matters from the gas to prevent engine relief.

In addition, the first housing 110 is provided with a shaft support 160 surrounding the outer circumferential surface of the first valve shaft 120, the shaft support 160 is at least one inlet hole 161 is the input It is formed in communication with the flow path connected to the port 112.

On the other hand, the inlet hole 161 guides the fuel to the first orifice 111 described above, and the first orifice 111 is opened and closed by the inclined valve 121 of the first valve shaft 120 stop. Perform pressure reduction while adjusting the volume.

In addition, a shaft spring 162 is installed between the first valve shaft 120 and the shaft support 160 to apply an elastic force to the valve 121 toward the first orifice 111.

Here, the valve 121 maintains a state in which the first orifice 111 is opened or closed at least by the upper end of the first valve shaft 120 in contact with the lower end of the piston 130. Then, when the high-pressure gas is introduced, the opening amount of the first orifice 111 is adjusted by the valve 121 which is pushed upward by the elastic force of the shaft spring 162 while pushing the piston 130 upward. The pressure is reduced.

In addition, the piston 130 is further provided with a rubber O-ring 131 to prevent the leakage of gas.

In addition, a first flow passage 113 is formed in the first housing 110 to communicate with the first orifice 111, and a stopper 114 is disposed between the first flow passage 113 and the piston 130. Is formed to prevent the first passage 113 from being blocked by the piston 130. That is, the first passage 113 and the first orifice 11 is composed of an open passage that is open.

In addition, a pair of second flow paths 115 communicating with the first flow passage 113 are formed in the first housing 110 to pressurize the first pressure-reduced gas to the second pressure reduction part 200. That is, gas is pumped toward the diaphragm 230 through the second orifice 211.

In addition, a flow preventing groove 116 is formed between the pair of second flow paths 115, and an insertion protrusion 221 corresponding to the flow preventing groove 116 is formed in the second valve shaft 220. The vibration and vibration caused by the tip motion of the second valve shaft 220 is prevented.

In addition, the seat 222 is formed on the surface facing the second orifice 211 of the second valve shaft 220, and the seat 222 is formed of rubber. Accordingly, the sheet 222 adjusts the opening amount of the second orifice 211 to reduce the pressure of the gas passing through the primary pressure reducing part 100 again. This decompression will be described later.

In addition, the inside of the second cap 240 is further provided with a guide port 260 in close contact with the diaphragm 230 while wrapping the second spring 250 to perform the pressure-reducing action through the tip motion Vibration is attenuated by preventing the flow of the pram 230 and the second spring 250.

In addition, the first decompression unit 100 is further provided with a hot water pot 170 and a hot water flow passage 171. More specifically, the inlet and outlet hot water port 170 is provided to the outside of the first housing 110, the hot water introduced to the hot water port 170 to surround the second flow path 115 It is circulated through the flow path 171 to prevent the icing.

For example, when the pressure is reduced through the first decompression unit 100, a sudden temperature decrease occurs due to the gas characteristics, which is prevented by the hot water port 170 and the hot water flow path 171.

In addition, the hot water circulating in the hot water port 170 and the hot water flow passage 171 uses cooling water to prevent heating of the engine.

Meanwhile, an air port 180 is formed in the first housing 110 to communicate with an upper end of the piston 130. In the air port 180, the flow rate of air is increased when the CN engine to which the regulator A of the present invention is applied is suddenly accelerated or full throttled. At this time, the increased flow rate is injected into the air port 180 so that the piston 130 and the first valve shaft 120 move to the lower side, and the valve 121 opens the first orifice 111 to flow the gas. Also increases. Therefore, the flow rate of gas is also adjusted in proportion to the flow rate of air.

The first cap 140 and the second cap 240 are provided with adjusting screws 141 and 241, respectively, to adjust the elastic force of the first and second springs 150 and 250 to finely adjust the flow rate of the gas.

In addition, at least one mounting hole 117 is formed at a lower end of the first housing 110 to attach the regulator A of the present invention to the vehicle.

In addition, the first decompression unit 100 is further provided with a shut-off valve 300 to control the inflow of gas, the shut-off valve 300 is preferably composed of a solenoid valve.

On the other hand, the first pressure reducing unit 100 is further provided with a pressure sensor 400 for measuring the pressure of the gas flowing into the input port 112.

In addition, the first pressure reducing unit 100 is further provided with a relief valve 500 for discharging the gas in order to prevent damage to the regulator (A) of the present invention when the pressure of the gas rises above the set pressure.

Since the shut-off valve 300 for intermitting the inflow of gas, the pressure sensor 400 for measuring the pressure of the gas, and the relief valve 500 for discharging when the pressure is higher than the set pressure of the gas are already used in the related art, Detailed description of the internal structure and operation thereof will be omitted.

The operation of the above-described regulator will be described below.

First, a high pressure gas flows into the input port 112 and is guided to the first orifice 111. Subsequently, the gas passing through the first orifice 111 pressurizes the piston 130 so that the piston 130 and the first valve shaft 120 move to an upper end thereof to open the opening amount of the first orifice 111. (121) is reduced, the primary decompression is achieved. At this time, in the case of natural gas fuel, the pressure is reduced to 7 ~ 8bar from 350bar.

In addition, after the primary decompression is completed, the gas is guided to the secondary decompression unit 200 through the first passage 113 and the second passage 115. Thereafter, the gas pressurizes the diaphragm 230 through the second orifice 211 so that the diaphragm 230 and the second shaft 220 compress and move the second spring 250 to move the second orifice 211. The second opening pressure is reduced by the sheet 222 reducing the amount of opening. At this time, the fuel of 7 ~ 8bar is reduced to 2 ~ 3bar is discharged to the output port 212 is delivered to the engine.

Accordingly, the first pressure reducing part 100 for reducing the pressure of the high pressure gas is provided with a piston 130, and the diaphragm 230 is applied to the second pressure reducing part for finely adjusting the pressure of the gas. To reduce the pressure.

As mentioned above, although the preferred embodiment of the present invention has been described in detail, the technical scope of the present invention is not limited to the above-described embodiment and should be interpreted by the claims. At this time, those of ordinary skill in the art should consider that many modifications and variations are possible without departing from the scope of the present invention.

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

2 is a view schematically showing a general CN engine vehicle.

3A to 3C are perspective views showing a regulator according to the present invention.

4 is a plan view showing a regulator according to the present invention.

FIG. 5 is a cross-sectional view of the 'A-A' part of FIG. 4.

6 is a cross-sectional view taken along the line 'B-B' of FIG. 5.

7 is a cross-sectional view taken along the line 'C-C' of FIG. 4.

* Description of symbols on main parts of the drawings *

A-Field Coil Assembly 100-First Pressure Reducing Unit

200-2nd reducing section 300-shut off valve

400-Pressure Sensor 500-Relief Valve

Claims (14)

In the regulator for reducing the fuel flowing into the input port to discharge to the output port, The first housing in which a first orifice is formed, a first valve shaft coupled to the first orifice, a piston in front of the first valve shaft in contact with one end of the first valve shaft, and an end portion in which the piston is installed; A first decompression unit comprising a first cap coupled to a first housing and a first spring coupled between the piston and the first cap; And A second housing coupled in a vertical direction of the first housing and having a second orifice formed therein; a second valve shaft coupled to the second orifice; and a diaphragm which is in contact with one end of the second valve shaft to perform a tip motion; A second pressure reducing part including a second cap coupled to the second housing to cover an end portion at which the diaphragm is installed, and a second spring installed between the diaphragm and the second cap; Regulator comprising a. The method of claim 1, The first housing is provided with a shaft support that surrounds the outer circumferential surface of the first valve shaft, the shaft support is characterized in that one or more inlet holes are formed. The method of claim 2, And a shaft spring is installed between the first valve shaft and the shaft support. The method of claim 1, And a first passage is formed in the first housing so as to communicate with the first orifice, and a stopper is formed between the first passage and the piston. The method of claim 4, wherein And a pair of second passages formed in the first housing in communication with the first passage. The method of claim 5, And a flow preventing groove is formed between the pair of second flow paths, and the second valve shaft has an insertion protrusion corresponding to the flow preventing groove. The method of claim 1, And a seat is formed on a surface facing the second orifice of the second valve shaft. The method of claim 1, The inside of the second cap regulator is characterized in that it further comprises a guide that is in close contact with the diaphragm while surrounding the second spring. The method of claim 1, The regulator, characterized in that the first pressure reducing portion is further provided with a hot water port and hot water flow path. The method of claim 1, The first housing is a regulator, characterized in that the air port is formed in communication with the upper end of the piston. The method of claim 1, The first and second cap regulator is characterized in that the adjustment screw is further provided. The method according to any one of claims 1 to 11, The first pressure reducing unit is provided with a shut off valve further characterized in that the regulator. The method according to any one of claims 1 to 11, The regulator, characterized in that the first pressure reducing portion is further provided with a pressure sensor. The method according to any one of claims 1 to 11, The first pressure reducing unit is a regulator, characterized in that further provided with a relief valve.

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