KR100885686B1 - Regulator for reducing gas pressure - Google Patents

Abstract

A regulator for gas pressure reduction is provided to regulate the internal pressure more precisely by using a solenoid valve to cut off the supply of gas fuel when the internal pressure increases. A regulator for gas pressure reduction comprises a solenoid valve(120) which is installed between a gas inlet(111) and a pressure chamber and opens/closes the gas flow path with electric signal, a pressure sensor(130) measuring the pressure of gas fuel flowing into the solenoid valve between the gas inlet and the solenoid valve, and a relief valve(170) discharging the gas fuel according to the pressure of gas fuel between the pressure chamber and a gas discharge port. The solenoid valve includes a stationary body(121) fixed inside, a movable body(122) moving in the same line as the stationary body, and an opening and shutting device(123) which opens and closes the entrance of the gas flow path along with the movement of the movable body.

Description

Regulator for Reducing Gas Pressure

The present invention relates to a gas pressure reducing regulator, and more particularly, to a gas pressure reducing regulator for reducing the pressure of the gas fuel supplied to the engine of the natural gas vehicle to be supplied to the engine.

In general, the fuel used in the vehicle is gasoline, diesel, or liquefied petroleum gas (LPG) .In the case of fuels such as gasoline and diesel, exhaust gas generated by incomplete combustion becomes the main cause of polluting the environment. have.

Accordingly, as a way to reduce environmental pollution, clean fuel, compressed natural gas (CNG), is used as a vehicle fuel. Compressed natural gas has high combustion efficiency, resulting in low emissions and environmental pollution. Nitrogen oxides and the like are advantageously less.

The compressed natural gas is stored in a fuel tank installed in the vehicle while the liquefied natural gas is maintained at a high pressure by a compression process, and the compressed natural gas is supplied at a low temperature of minus 162 ° C. Therefore, before the compressed natural gas is supplied to the engine, the pressure of the gas fuel is reduced and supplied to the engine.

Since the gas fuel is supplied to the engine in a high-pressure gas state, the gas fuel must be supplied with a constant flow rate and pressure supplied to the engine, and a regulator for adjusting the pressure of the gas fuel to the engine using the gas fuel Is installed.

In addition, as shown in FIG. 1, in the gas vehicle, a control valve 5 for supplying and blocking gas fuel and a fuel are reduced in pressure to stably supply a mixer in which gas and air are mixed to the engine 20. It consists of the regulator 10 which adjusts a fuel amount, and the mixer 15 which mixes air and fuel to an optimal combustion condition.

The control valve 5 is to supply and cut off fuel as the engine 20 operates or stops the fuel compressed and stored in the fuel tank 1 at high pressure, which is manually opened or closed by an electronic automatic shutoff valve. Is done.

In addition, the regulator 10 reduces the pressure of the gas fuel supplied through the control valve 5 and at the same time reduces and regulates the gas required for the engine 20 to a predetermined pressure or less.

Such a regulator is disclosed in Document 1, which is shown in FIG.

As shown in FIG. 2, the regulator 10 includes a gas supply port 6 including a valve 6a for controlling the amount of gas supplied from the control valve 5, expansion and The contracted diaphragm (7), the pressure adjusting screw (8a) for adjusting the flow rate of the gas, the balance spring (8) for pressing the diaphragm (7) and the operation of the diaphragm (7) is lowered when the gas supply port (6) It consists of a lever (9) for opening and closing the valve (6a) attached to the.

The regulator 10 is a fuel having a constant pressure is introduced into the interior through the valve (6a) installed at the end of the gas supply port 6, thereby pushing the diaphragm (7) upward while the room pressure rises.

At this time, the balance spring (8) installed on the upper surface of the diaphragm (7) is contracted, and the main spring (9a) mounted on the lower portion of the lever (9) is expanded while closing the valve (6a) installed on the gas supply port (6) gas The supply is cut off.

The gas fuel decompressed as described above is discharged through the gas outlet 10a formed at one side, and at the same time, the diaphragm 7 is lowered by elasticity of the balance spring 8 so that the lower lever 9 is operated downward to operate the gas supply port. Gas is supplied by opening the valve 6a of (6), and the high pressure fuel is depressurized by the repetitive control of the opening and closing of the valve 6a.

In addition, the balance spring 8 is capable of adjusting the amount of fuel introduced into the interior by the pressure control screw (8a) installed on the top.

[Reference 1] Korea Utility Model Registration No. 289663 (registered Sep. 4, 2002)

In the conventional regulator, as the valve is opened and closed according to the pressure of the regulator, gas is supplied and shut off. Therefore, when the amount of gas fuel used in the engine is reduced, the pressure of the regulator is increased to properly adjust the pressure of the gas fuel. Since the valve is not opened and closed by the diaphragm, there is a problem that the accuracy of opening and closing the valve is lowered.

The present invention has been made to solve the above problems, an object of the present invention is to adjust the pressure of the regulator by the operation of the solenoid to cut off the supply of gas fuel when the pressure inside the regulator is increased due to the reduced use of fuel in the engine To provide a regulator for reducing the gas pressure to more precisely control.

Another object of the present invention is to provide a gas pressure reducing regulator for controlling the pressure of the regulator by discharging the gas fuel to the outside when the pressure of the regulator is excessively increased.

In order to achieve the above object, the gas decompression regulator of the present invention includes a body having a gas inlet, a gas outlet, and a pressure chamber formed of an upper pressure chamber and a lower pressure chamber, a diaphragm that is elevated according to the amount of gas flowing into the gas inlet, and a pressure of a gas fuel. A balance spring for elastically supporting the diaphragm in the lower portion of the pressure adjusting screw for adjusting the pressure, and a gas pressure regulator for opening and closing the adjustment shaft for opening and closing the flow path of gas fuel on the bottom of the diaphragm, between the gas inlet and the pressure chamber A solenoid valve installed to open and close the gas flow path by an electrical signal, the solenoid valve is fixed to the inside fixed from one side, a moving body coupled to be movable in the same line as the fixed body, the gas flow path in accordance with the movement of the moving body Dog entrance It is characterized in that it comprises an opening and closing to close.

Such a gas pressure reducing regulator of the present invention is provided with a solenoid valve flowing into the gas inlet to block the inflow of gas fuel in accordance with the gas fuel pressure, and discharges the gas fuel when the gas fuel pressure in the regulator is excessively high, Accordingly, the pressure of the regulator can be properly adjusted, and the pressure of the regulator can be maintained appropriately, so that the gas fuel can be stably supplied to the engine.

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

Figure 3 is a perspective view showing a gas pressure reducing regulator of the present invention, Figure 4 is a cross-sectional view of the gas pressure reducing regulator of the present invention, Figure 5 is a cross-sectional view of the gas pressure reducing regulator of the present invention is closed.

3 to 5, the gas pressure regulator 100 of the present invention is a gas inlet 111, gas outlet 112, the gas flow passage 113, the body 110 is formed with a pressure chamber, Solenoid valve 120 for supplying and blocking gas fuel on the gas flow passage 113 toward the gas inlet 111, pressure sensor 130 for measuring the pressure of the gas fuel flowing into the gas inlet 111, The diaphragm 140 which is elevated according to the amount of gas introduced from the gas inlet 111 into the pressure chamber, the balance spring 160 which elastically supports the diaphragm 140, and a gas fuel flow path on the bottom surface of the diaphragm 140. Opening and closing control shaft 150 for opening and closing the, Double spring 160 installed on the outside of the opening and closing control shaft 150, Relief valve 170 for discharging the gas fuel between the gas outlet 112 from the pressure chamber Is done.

The body 110 has a gas inlet 111 through which the gas fuel stored in the fuel tank (not shown in the drawing) is introduced, and the gas discharged to supply the gas fuel introduced into the gas inlet 111 to the engine. An outlet 112 is formed, and a gas flow passage 113 through which gas fuel flows is formed between the gas inlet 111 and the gas outlet 112.

In addition, a pressure chamber is formed inside the body 110. The pressure chamber has a lower pressure chamber 115 that is decompressed to a lower pressure as the gas fuel of high pressure passes and an upper pressure to maintain an appropriate pressure according to supply and shut off of the gas fuel. It is formed of a yarn 116.

In addition, the gas flow passage 113 is formed toward the gas outlet 112 in the upper pressure chamber 116, the branch flow passage 114 is branched between the gas outlet 112 in the upper pressure chamber 116 and connected to the chamber 14a. ) Is formed, and the branch flow passage 114 is formed at the lower portion of the lower pressure chamber 115, that is, the chamber 114a at which the outlet pressure is applied to the lower end of the opening / closing control shaft 150.

In addition, the gas inlet 111 is provided with a solenoid valve 120 for supplying or blocking gas fuel in accordance with the pressure of the gas fuel.

The solenoid valve 120 is a fixed body 121 is fixed to the inside of the solenoid valve 120, the movable body 122, the movable body 122 is installed to be movable in the same line as the fixed body 121. Opening and closing port 123 is fixed to the front end, it consists of a support spring 124 is installed between the fixed body 121 and the moving body (122).

The stationary body 121 is sealed to prevent the gas fuel introduced into the solenoid valve 120 from leaking, and the movable body 122 is a gas fuel introduced from the gas inlet 111 to the inlet of the gas flow passage 113. It is formed to a diameter smaller than the inner diameter of the solenoid valve 120 to be moved.

In addition, the opening and closing port 123 is to open and close the inlet of the gas flow passage 113 in accordance with the movement of the moving body 122, when the opening and closing port 123 is in close contact with the inlet of the gas flow passage 113, the flow of gas fuel is blocked, When the opening and closing port 123 is separated from the inlet of the gas flow passage 113, it is formed soft so that the gas fuel is supplied.

In addition, the support spring 123 installed between the fixed body 121 and the movable body 122 has a movable body 122 so that the movable body 122 blocks the inlet of the gas flow passage 113 when the solenoid valve 120 is not operated. ) Is pushed toward the inlet of the gas flow passage 113.

In addition, the coil 125 for moving the movable body 122 is wound around the fixed body 121 and the movable body 122 by the applied current, and the coil 125 retreats the movable body 122 by the applied current. Let's go.

The pressure sensor 130 measures the pressure of the gas fuel flowing from the gas inlet 111.

In addition, the diaphragm 140 is formed in a cup shape, the shape of which extends downward, and is fixed to be liftable between the lower pressure chamber 115 and the upper pressure chamber 116, the opening and closing adjustment shaft in the lower pressure chamber 115 150 is installed to be elevated, and the balance spring 160 is fixed to the upper pressure chamber 116.

In addition, the lower pressure chamber 115 is fixed with a filter 151 for filtering foreign substances contained in the gas fuel while lowering the pressure of the gas fuel flowing through the gas flow passage 113.

In addition, a vertical flow path 152 through which gaseous fuel passes is formed on the lower pressure chamber 115, and a lower pressure chamber 115 is disposed inside the vertical flow path 152 so that no ice is generated in the regulator 100. ) And a sheet 153 made of a heat insulating material surrounding the vertical flow path 152 is fixed.

In addition, a pipe 154 having thermal conductivity is installed between the body 110 and the sheet 153, and the pipe 154 has a sheet 153 for heat having high temperature coolant supplied into the body 100. Will be delivered to

In addition, the air layer 154a having a heat insulation function is formed outside the pipe 154 so that cool heat is not transferred from the lower pressure chamber 115 to the body 110. The air layer 154a has a low temperature when the external temperature is low, such as winter, the pipe 154 has a low temperature, and the low temperature of the pipe 154 is transferred to the sheet 153.

In this case, since the heat is transferred by the air layer 154a in a reduced state, the temperature of the sheet 153 is remarkably prevented.

In addition, the temperature of the sheet 153 is increased by the heat conducted through the pipe 154, and as the temperature of the sheet 153 is increased, the temperature of the sheet 153 is rapidly prevented from being lowered during gas pressure reduction, and the air layer 154a. ) Will provide maximum insulation.

The opening and closing control shaft 150 and the seat 153 is different in material so that noise does not occur during the reciprocating movement of the opening and closing control shaft 150, the seat 153 is made of a heat insulating material having elasticity, opening and closing control The shaft 150 is made of a hard material so that noise does not occur due to the elasticity of the seat 153 during the reciprocating motion of the opening and closing control shaft 150.

The lower pressure chamber 115 is installed to open and close the control shaft 150 to open and close the vertical flow path 152, the overlapping spring 155 is installed outside the opening and closing control shaft 150.

In addition, a cooling chamber 156 through which cooling water is circulated is formed in an outer lower portion of the lower pressure chamber 115, and a cooling water inlet tube 157 through which cooling water is introduced and a cooling water discharge tube 158 through which cooling water is discharged are formed.

The coolant inlet pipe 157 and the coolant discharge pipe 158 are formed to be bent down the regulator 100, as shown in Figure 3 to facilitate the installation of the regulator 100, the coolant inlet pipe 157 and the coolant discharge pipe 158 may be formed extending in the horizontal direction.

In addition, the nipple 161 connected to the throttle valve (not shown) of the engine is fixed to the upper pressure chamber 116, and a pressure adjusting screw 162 is installed on the upper surface of the upper pressure chamber 116. In addition, the support plate 163 is fixed to the lower end of the pressure adjusting screw 162, and the balance spring 160 is installed between the support plate 163 and the diaphragm 140.

In addition, a relief valve 170 for discharging a part of the gas fuel to the outside is installed between the gas flow passage 113 and the gas outlet 112 when the pressure of the gas fuel is excessively high.

The relief valve 170 maintains the pressure of the gas flow passage 113 at a set pressure. When the pressure of the gas flow passage 113 is increased, the relief valve 170 discharges the gas fuel, and the pressure of the gas flow passage 113 is at the set pressure. Is closed. Since the relief valve 170 uses a conventional relief valve 170, detailed description of the relief valve 170 will be omitted in the present invention.

In the gas pressure regulator 100 of the present invention having such a configuration, the high pressure gas fuel is introduced into the solenoid valve 120 through the gas inlet 111 from the fuel tank.

The gas fuel introduced in this way is introduced between the fixed body 121 and the mobile body 122 through an outer gap of the mobile body 122, and the mobile body 122 of the solenoid valve 120 is caused by the elasticity of the support spring 124. As shown in FIG. 5, the inlet of the gas flow passage 113 is maintained in a closed state, and the solenoid valve 120 moves on the left side of the drawing due to magnetic force when an applied current flows in the coil 124. Will be moved to.

At this time, the diaphragm 140 is maintained in the open state by the opening and closing adjustment shaft 150 of the lower pressure chamber 115 and the balance spring 160 of the upper pressure chamber 116.

Accordingly, the opening and closing port 123 blocking the gas flow passage 113 opens the inlet of the gas flow passage 113, and the gas fuel introduced into the gas inlet 111 flows through the lower pressure chamber 115 along the gas flow passage 113. ) Into the.

In addition, since the filter 151 is installed inside the inlet of the lower pressure chamber 115, foreign matter contained in the gaseous fuel is filtered out of the filter 151, and the high pressure gas fuel falls to the low pressure. ) Flows inside.

The gas fuel introduced into the lower pressure chamber 115 moves toward the diaphragm 140 through the open vertical flow path 152, and the pressure of the gas fuel is reduced, and between the diaphragm 140 and the gas outlet 112. The decompressed gas fuel is moved along the formed gas flow passage 113.

At this time, the seat 153 fixed to the vertical flow path 151 prevents the heat source of the low temperature gas fuel from being transferred to the body 110 so that the regulator 100 does not freeze, and the coolant circulating the engine has a coolant inlet pipe. The 157 and the cooling water discharge pipe 158 are introduced into the cooling chamber 156 from the engine and circulated to prevent freezing caused by the gaseous fuel.

In addition, when the gas fuel is depressurized, the gas fuel is lowered to a low temperature, and the freezing is prevented by the sheet 153 of the heat insulating material and the pipe 154 having thermal conductivity.

The gas fuel passing through the lower pressure chamber 115 is discharged to the gas outlet 112 and supplied to the engine, and is opened and closed by a pressure acting on the chamber 114a according to the outlet pressure of the gas outlet 112. 150) is elevated.

That is, when a large amount of gas fuel is sucked from the engine, the gas flow passage 113 is changed to the low pressure state, and the chamber 114a connected to the branch flow passage 114 is also changed to the low pressure state. When the chamber 114a is at a low pressure, the pressure to pull the opening / closing control shaft 150 toward the lower side acts to lower the opening / closing control shaft 150 together with the pressure acting on the upper pressure chamber 116.

In addition, when a small amount of gaseous fuel is sucked from the engine, the gas flow passage 113 is changed to a high pressure state, and the chamber 114a connected to the branch flow passage 114 is also changed to a high pressure state.

When the chamber 114a becomes a high pressure, a pressure for pushing the opening / closing control shaft 150 to the upper side acts to further raise the opening / closing control shaft 150 together with the pressure acting on the lower pressure chamber 115.

Accordingly, as the gas fuel moves up and down the control shaft 150 in accordance with the outlet pressure corresponding to the chamber 114a and the gas outlet 112, the outlet pressure of the gas fuel discharged from the gas outlet 112 is more stably. It can be maintained.

In addition, when the consumption of gaseous fuel in the engine is reduced, the supply of gaseous fuel is reduced. The diaphragm 140 rises as the pressure in the upper pressure chamber 116 decreases, and the opening / closing control installed in the lower pressure chamber 115 is reduced. The shaft 150 is raised to narrow the interval of the vertical flow path 152, thereby reducing the amount of gas fuel supplied to the engine.

In addition, when the supply amount of gaseous fuel consumed in the engine increases, the diaphragm 140 descends as the pressure in the upper pressure chamber 116 increases, and the opening / closing adjustment shaft 150 of the lower pressure chamber 115 descends to vertically. As the interval of the flow path 152 is widened, the supply amount of the gas fuel supplied to the engine is increased.

As such, the gas fuel is increased or decreased from the fuel tank to the engine, and the gas fuel of excessively high pressure may be introduced from the gas inlet 111.

When the gas fuel of excessive pressure is introduced, the solenoid valve 120 is cut off to temporarily cut off the supply of the gas fuel, and the blocking of the solenoid valve 120 detects the pressure of the gas fuel at the pressure sensor 130 so that the solenoid The current applied to the valve 120 is cut off.

As the current of the solenoid valve 120 is cut off, the movable body 1220 is moved toward the inlet of the gas flow passage 113 by the support spring 124, and the opening / closing opening 123 at the tip of the movable body 122 is the gas flow passage. As the 113 is closed, the gas flow passage 113 is blocked, so that the supply of gas fuel is blocked.

On the other hand, when the gas fuel of low pressure is supplied to the gas flow passage 113 and the consumption of the gas fuel decreases rapidly, the gas fuel in the gas flow passage 113 rises to a high pressure, and when the gas flow passage 113 changes to high pressure, the relief The valve 170 is opened to lower the pressure of the gas flow passage 113.

The relief valve 170 is closed when the pressure of the gas flow passage 113 becomes a set pressure to maintain the pressure of the gas flow passage 113 at the set pressure.

The present invention can be supplied and shut off by maintaining the pressure of the gas fuel at the set pressure to reduce the fuel consumption as well as to supply the gas fuel at a stable set pressure so as not to burden the engine.

1 is a schematic diagram showing the overall configuration of a conventional fuel device.

2 is a cross-sectional view showing a conventional gas pressure reducing regulator.

Figure 3 is a perspective view showing a gas pressure reducing regulator of the present invention

Figure 4 is a cross-sectional view of the gas pressure reducing regulator of the present invention opened.

Figure 5 is a closed cross-sectional view of the gas pressure reducing regulator of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: regulator 110: body

111: gas inlet 112: gas outlet

113: gas flow path 115: lower pressure chamber

116: upper pressure chamber 120: solenoid valve

121: stationary body 122: mobile body

123: opening and closing 124: support spring

125: coil 130: pressure sensor

140: diaphragm 150: opening and closing adjustment shaft

151: filter 152: vertical flow path

153: Sheet 155: Nesting Spring

156: cooling chamber 160: balance spring

161: nipple 162: pressure adjustment screw

163: base plate 170: relief valve

Claims (12)

A body having a pressure inlet formed of a gas inlet and a gas outlet, and an upper pressure chamber and a lower pressure chamber, a diaphragm which is lifted according to the amount of gas flowing into the gas inlet, and a lower portion of the pressure adjusting screw that adjusts the pressure of gas fuel. A regulator for reducing gas, comprising a balance spring for supporting and an opening / closing adjustment shaft for opening and closing a gas fuel passage on a bottom surface of the diaphragm. A solenoid valve installed between the gas inlet and the pressure chamber to open and close the gas flow path by an electrical signal; The solenoid valve includes a fixed body fixed inwardly from one side, a mobile body movably coupled in the same line as the fixed body, opening and closing opening and closing the gas flow path inlet according to the movement of the mobile body Regulator. The method of claim 1, And a pressure sensor for measuring the pressure of the gas fuel flowing into the solenoid valve between the gas inlet and the solenoid valve. The method of claim 1, And a relief valve for discharging the gas fuel according to the pressure of the gas fuel between the pressure chamber and the gas outlet. The method of claim 1, Gas regulator for reducing pressure, characterized in that the outer side of the opening and closing shaft is provided with an overlapping spring overlapping two springs having different diameters. The method of claim 1, The gas flow passage is provided with a branch flow passage branched between the gas outlet in the lower pressure chamber, the gas pressure regulator characterized in that it comprises a chamber connected to the branch flow passage in the lower portion of the opening and closing control shaft. The method according to any one of claims 1 to 5, A regulator for reducing gas, characterized in that a support spring for elastically supporting the movable body is provided between the fixed body and the movable body. The method of claim 6, The diaphragm has a gas pressure reducing regulator, characterized in that formed in a cup shape protruding downwardly The method of claim 6, The lower pressure chamber is a gas pressure regulator, characterized in that the cooling chamber is provided with the cooling water circulated. The method of claim 1, The seat is installed in a form surrounding the lower pressure chamber and the vertical flow path, And a filter installed between the gas inlet and the lower pressure chamber. The method of claim 9, A regulator for reducing gas, characterized in that a pipe having a thermal conductivity is provided on the outside of the sheet. The method of claim 10, A regulator for reducing gas, characterized in that an air layer is formed between the sheet and the pipe. The method of claim 11, The seat and the regulating shaft is a gas pressure regulator, characterized in that made of different materials.

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