KR100977418B1 - Fuzzy Valve of Low Temperature Start-up - Google Patents

Abstract

The present invention relates to a purge valve having improved low-temperature startability that enables the engine to be started smoothly even at low temperatures by heating a flow path even if low-temperature fuel is supplied. The discharge body is formed, and a lower body having a flow path fitting portion formed at an outlet end thereof, and an inlet is formed. A valve seat is formed on the flow path connected to the inlet, and an upper body having a solenoid assembly installed on the upper surface thereof and a lower recessed groove recessed upwardly on the bottom surface thereof, a casing, a sleeve fixed inside the casing, and a coil wound around the outer peripheral surface of the sleeve And a solenoid assembly coupled to the upper body by a core fixed to the inside of the sleeve, a plunger installed to be elevated on the bottom of the core, a valve face seated on the valve seat at the bottom of the plunger, and an indentation groove of the upper body. Installed flow path The key is characterized in that it contains a repetition Mr. assembly.

As described above, the present invention provides a PtC assembly to surround the flow path, thereby quickly thawing the flow path frozen by heating of the PtC assembly, and preventing freezing of the flow path according to the movement of low temperature fuel, and external dust caused by the diaphragm. By blocking the inflow of foreign matters, it is possible to smooth the lifting and lowering of the plunger, there is a useful effect that can maintain the smooth operation of the solenoid assembly does not flow moisture into the solenoid assembly.

Purge Valve, Solenoid, PtC Assembly, PtC Element, Diaphragm

Description

Fuzzy Valve of Low Temperature Start-up

The present invention relates to a purge valve having improved low temperature startability, and more particularly, to a purge valve having improved low temperature startability such that the valve does not freeze with the movement of a low temperature fluid.

In general, a vehicle engine includes a gasoline engine using gasoline as a fuel and a diesel engine using diesel fuel.

The internal combustion engine of such a gasoline engine or a diesel engine emits harmful exhaust gas, and a hybrid vehicle equipped with an internal combustion engine and an electric engine has been developed to reduce emission of the exhaust gas.

In addition, the engine includes an Elpia engine using liquid fuel, and a hydrogen engine using hydrogen as a fuel has been developed.

In addition, the Elpia engine and the hydrogen engine will be described briefly.

Unlike the mechanical LPG fuel system, which is dependent on the pressure of the cylinder, the LPG liquid (Liquified Petroleum Injection) engine installs a fuel pump in the cylinder and supplies the LPG fuel at a high pressure (5 to 15 bar) by the fuel pump. ) It is a method of liquefying and supplying liquid fuel to the injector to inject by cylinder to drive the engine.

Since the LPI engine injects liquid fuel, components such as a vaporizer and a mixer, which are components of a mixer type LPG engine, are not required. The newly applied components include a high pressure injector, a fuel pump installed in a cylinder, a fuel supply line, and an LPI. Dedicated electronic control units (ECUs) and regulator units that regulate fuel pressure.

ELPIA's electronic control unit receives input signals from various sensors to determine the engine's condition and controls fuel pumps, injectors and ignition coils for optimum air-fuel ratio and engine performance.

The fuel pump is controlled according to the amount of fuel required by the engine to supply liquid fuel to the engine, and the injector injects fuel for each cylinder to realize an optimal air-fuel ratio.

In addition, the fuel cell is a device that converts the chemical energy of the fuel into electrical energy directly in the cell without converting the chemical energy into heat by combustion, and is a pollution-free power generation device that has been recently studied with interest.

In such a fuel cell, a fuel cell stack including a fuel cell assembly in which a unit cell for generating electricity is stacked and peripheral parts thereof is supplied with hydrogen as a fuel gas as an anode and oxygen as an oxidant as a cathode to produce electricity. do.

As described above, a vehicle using a fuel cell as a driving source needs to supply hydrogen, which is stored in a vehicle, to the fuel cell in advance for electricity production.

The hydrogen supply system provided in the fuel cell vehicle includes a large number of hydrogen tanks storing hydrogen at high pressure (about 350 bar), solenoid valves installed at the outlet of each hydrogen tank to selectively supply / block hydrogen, hydrogen tanks and fuel cells. It consists of a hydrogen line, a shutoff valve and a regulator installed on the hydrogen line, control means for valve control and the like.

When the vehicle is started on with the hydrogen supply system, the solenoid valves of the respective hydrogen tanks are opened so that high pressure hydrogen flows on the hydrogen lines, and the hydrogen passes through the open valves. The regulator is depressurized to about 1 to 2 bar and enters the fuel cell.

Hydrogen supplied to the fuel cell reacts with oxygen in the fuel cell to produce electricity, and the electricity drives the motor by driving the motor.

On the other hand, when the vehicle is turned off, the supply of hydrogen is cut off while the solenoid valve of each hydrogen tank and the shutoff valve on the hydrogen line are closed.

In the hydrogen supply system, the solenoid valve and the shutoff valve are closed when the vehicle is turned off, and the hydrogen supply is shut off, but the high pressure hydrogen in the hydrogen line continues to remain in the hydrogen line (10 m or more in the case of a bus). .

Solenoid valves are used to control the flow of fluid as well as the vehicle.

Such a solenoid valve regulates the flow of fluid by turning on / off the valve according to the input of an electrical signal, and is controlled by closing or opening by the movement of the plunger when the solenoid is energized or not.

The solenoid valve may be of a normally closed type that normally maintains a closed state or a normally open type that maintains a normally open state.

In addition, the solenoid valve is mainly used for the hydraulic solenoid valve used in the hydraulic circuit, the air solenoid valve used in the pneumatic circuit, the solenoid valve using the electromagnetic force.

A purge valve using such a solenoid valve as a driving source is used, which is briefly shown in FIG.

As shown in FIG. 1, the purge valve 10 includes a solenoid assembly 11 and a body 20 in which a flow path is formed.

The solenoid assembly 11 has a sleeve 13 fixed inside the casing 12, and a coil 15 is wound around the bobbin 14 on the outer circumferential surface of the sleeve 13.

In addition, the core 16 is fixed to the inside of the sleeve 13 having a hollow shape by a bolt 17, and a plunger 18 which is lifted and lowered by electromagnetic force is provided on the bottom of the core 16, and above the plunger 18. The return spring 19 is provided, and the valve face 18a which opens and closes a flow path is provided in the plunger 18 lower end.

The body 20 is formed with an inlet 21 through which fluid is introduced on one side, an outlet 22 is formed on the other side, a flow path 23 connected with the inlet 21 and the outlet 22 is formed, the valve The valve seat 24 is formed in the part which contact | connects the face 20. As shown in FIG.

The flow path 23 is the electromagnetic force generated in the coil 15 by the current applied in accordance with the electrical signal in the state blocked by the valve face 18a, the valve as the plunger 18 is raised by the electromagnetic force The face 18a is raised to open the valve seat 24.

As the flow path 23 is opened in this way, the fluid flows in the flow path 23 formed between the inlet 21 and the outlet 22. As described above, low-temperature liquid fuel flows.

As the low-temperature liquid fuel flows in the flow path 23, the flow path 23 is blocked by the freezing phenomenon, and foreign matter is caught in the plunger 18 in contact with the fuel, so that the plunger 18 smoothly flows. There was a problem that did not work.

That is, in winter, when the external temperature is low, the plunger 18 does not operate normally due to the icing of the valve seat and the valve face. Accordingly, the fuel supply is not smoothly performed and the engine starts to be delayed. The flow path of the liquid fuel can be blocked by the tar generated as a long time flow, there was a problem that the fuel is not supplied smoothly because the flow path is frozen by water or moisture generated during the reaction of hydrogen and oxygen.

The present invention has been made in order to solve the above problems, an object of the present invention is to ensure that the engine starts smoothly even at low temperatures by heating the flow path with a positive temperature coefficient (PTC) assembly even when a low temperature fuel is supplied It is to provide a purge valve with improved startability.

Another object of the present invention is to provide a purge valve having improved low-temperature startability by installing a diaphragm on the outer circumferential surface of the plunger to prevent foreign substances from being caught in the plunger.

In order to achieve the above object, the purge valve having improved low temperature startability of the present invention includes a lower body having a discharge port formed therein and a flow path fitting portion formed at an end of the discharge port, an inlet formed with a valve seat on the flow path connected to the inlet, and a solenoid on the upper surface thereof. An upper body having an assembly installed and having a lower recessed groove recessed to an upper side thereof, a casing, a sleeve fixed to the inside of the casing, a coil wound around the sleeve outer circumference, a core fixed to the inside of the sleeve, and an elevated bottom of the core A plunger installed, a solenoid assembly composed of a valve face seated on the valve seat at the bottom of the plunger and coupled to an upper surface of the upper body, and a PTC assembly installed in the recess of the upper body to heat the flow path. do.

An upper concave groove is formed in the upper body from the upper surface to the valve seat, an end of the diaphragm is fixed to the upper concave groove upper surface, and a plunger is fixed in the center of the diaphragm.

The PTC assembly may include a case fixed to the outer circumferential surface of the flow path, a PTC device fixed to the inside of the case, a spring that closely contacts the PTC device to the case, and a body fixed to the bottom of the case.

The flow path has a protruding flow path protruding to the bottom surface of the upper body, the protruding flow path is characterized in that is fitted into the flow path fitting portion is fixed.

The lower body has a first O-ring groove is formed on the outer side of the flow path fitting portion, the second O-ring groove is formed on the upper surface of the lower body spaced apart from the first O-ring groove, the first O-ring groove and the second O-ring groove The first O-ring and the second O-ring are fixed to each other.

As described above, the present invention provides a PtC assembly to surround the flow path, thereby quickly thawing the flow path frozen by heating of the PtC assembly, and preventing freezing of the flow path according to the movement of low temperature fuel, and external dust caused by the diaphragm. By blocking the inflow of foreign matters, it is possible to smooth the lifting and lowering of the plunger, there is a useful effect that can maintain the smooth operation of the solenoid assembly does not flow moisture into the solenoid assembly.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a cross-sectional view showing a purge valve having improved low temperature startability of the present invention, and FIG. 3 is an enlarged cross-sectional view showing a purge valve having improved low temperature startability according to the present invention.

As shown in Figures 2 and 3, the low temperature startability of the purge valve 100 of the present invention is the lower body 110, the upper body 130 is fixed to the lower body 110, the upper body ( 130) a solenoid assembly 150 installed on the upper portion, a positive temperature coefficient (PTC) assembly 170 installed on the upper body 130, and a diaphragm 190 installed on the solenoid assembly 150; It is composed.

As shown in FIG. 3, the lower body 110 has an outlet 111 formed at one side, and a channel fitting portion 121 is vertically formed at an end of the outlet 111, and the channel fitting 121 is formed. The first O-ring groove 112 is formed on the outside, the second O-ring groove 113 is formed on the upper surface of the lower body (110).

In addition, the first O-ring groove 112 and the second O-ring groove 113 is fixed to the first O-ring 114 and the second O-ring 115, respectively.

In addition, the inlet 131 is formed on one side of the upper body 130, and a flow path 120 is formed in which the inlet 131 and the outlet 111 are connected.

The lower concave groove 132 is formed on the bottom of the upper body 130, and the upper concave groove 133 is formed on the upper surface of the upper body 130.

That is, the flow path 120 is formed such that the outlet 111 of the lower body 110 is connected from the inlet 131 of the upper body 130, and the valve seat 134 is formed on the upper surface of the flow path 120.

In addition, the flow path 120 formed in the lower recessed groove 132 has a protruding flow path 123 in which a part of the flow path 120 protrudes to the bottom surface of the upper body 130 as shown in FIG. 3, and the protruding flow path 123. 2 is fixed to the flow path fitting portion 121, as shown in FIG.

In addition, the solenoid assembly 150 is coupled to the upper portion of the upper body 130.

The solenoid assembly 150 has a casing 151, a hollow sleeve 152 fixed inside the casing 151, a bobbin 153 fixed to an outer circumferential surface of the sleeve 152, and wound around the bobbin 153. Is installed between the coil 154, the core 155 fixed in the sleeve 152, the plunger 156 coupled to the bottom of the core 155 so as to be elevated, and between the plunger 156 and the core 155. It includes a return spring 157, a valve face 158 fixed to the lower end of the plunger 156 to open and close the valve seat 134.

In addition, the bottom of the plunger 156 is fixed to the frame 159, the support portion 160 is formed on the frame 159 is supported by the diaphragm 190, the bottom of the frame 159 to open and close the valve seat 134 The valve face 158 is fixed.

Since the solenoid assembly 150 is a conventional technology, a detailed description thereof will be omitted.

In addition, the lower recessed groove 132 is provided with a PTC assembly (170) for heating the flow path (120).

The PTC assembly 170 is elastically supporting the case 171 inserted into the lower insertion groove 132, the PTC element 172 fixed inside the case 171, and the PTC element 172. It is configured to include a spring 173, the body 174 is fitted to the case 171 and the wire 175 connected to the PTC element 172.

That is, the case 171 is formed in a '∩' shape as shown in FIG. 3 so that the protrusion flow path 123 is fitted in the center as well as the lower insertion groove 132, and is fitted inside the case 171. The spring 173 is fixed between the PTC element 172 and the body 174 so that the PTC element 172 does not flow.

In addition, the plunger 156 is provided with a diaphragm 190. The diaphragm 190 is fixed to the upper end of the upper body 130, the center is fixed to the support portion 160 of the plunger 156 is made to move up and down with the plunger 156.

As shown in FIG. 2, the diaphragm 190 has a portion of a substantially 'V' shape in cross section, and when the plunger 156 is raised, a central portion of the diaphragm 190 is extended and is raised, and when the plunger 156 is lowered, the diaphragm ( 190) The central portion is returned to its original position, and foreign matters such as external dust are blocked from contacting the upper recessed groove 133 and the plunger 156.

In the purge valve 100 having the low temperature startability of the present invention having the above configuration, the valve face 158 is in contact with the valve seat 134 in a state where no fuel is supplied, that is, the engine is not started, and thus the flow path 120 ) Is blocking.

In this way, power is applied to the vehicle to start the vehicle in the state where the flow path 120 is blocked, and power is also applied to the PTC assembly 170 to heat the PTC assembly 170.

That is, when power is applied through the wire 175, the PTC element 172 is heated, and the flow path 120 is heated as the protrusion passage 123 is heated by the PTC element 172.

Meanwhile, as the outside temperature decreases as in winter, when the flow path 120, the valve seat 134, and the valve face 158 are frozen, the freezing flow path is thawed by heating of the PTC assembly 170.

The valve seat 134 and the valve face 158 are thawed by the heating of the PTC assembly 170 so that the plunger 156 is quickly operated by the solenoid assembly 150 as well as the flow path 120 by the plunger 156. ) Opens quickly to supply liquid fuel or hydrogen fuel.

Since the solenoid assembly 150 in the present invention is a conventional technology, a detailed description of its operation will be omitted.

In addition, an Elpia engine, an engine using hydrogen as a fuel, and the flow path 120 may freeze as a low temperature fuel is supplied for a long time, but as the PTC assembly 170 surrounding the flow path 120 is heated, 120 can be prevented from freezing.

In addition, the diaphragm 190 is installed in the upper recess groove 133 of the plunger 156 and the upper body 130 to block foreign matters such as dust from the outside, as well as to the outside by the sleeve 152 and the diaphragm 190. Blocked, the inflow of foreign matter and moisture to the solenoid assembly 150 is blocked.

That is, the diaphragm 190 is formed in a substantially 'V' shape so that when the plunger 156 is raised, the diaphragm 190 is raised together with the plunger 156 when the plunger 156 is lowered, but the diaphragm is lowered. End 190 is fixed to the upper surface of the upper body 130 is blocked the inflow of foreign matter and moisture to the upper concave groove 133 and the solenoid assembly 150.

1 is a schematic cross-sectional view showing a conventional purge valve.

2 is a cross-sectional view showing a purge valve having improved low temperature startability of the present invention.

3 is an enlarged cross-sectional view showing a purge valve having improved low temperature startability of the present invention.

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

100: purge valve 110: lower body

111: outlet 112: first O-ring groove

113: second O-ring groove 114: first O-ring

115: second O-ring 120: euro

121: flow path fitting portion 123: protruding flow path

130: upper body 131: inlet

132: lower recessed groove 133: upper recessed groove

134: valve seat 150: solenoid assembly

151: casing 152: sleeve

153: bobbin 154: coil

155: core 156: plunger

157: return spring 158: valve face

170: PTC assembly 171: case

172: PTC element 173: spring

174: body 175: wire

190: diaphragm

Claims (5)

A lower body having an outlet and a flow path fitting portion formed at an end of the outlet, An upper body having an inlet formed therein and a valve seat formed on a flow path connected to the inlet and having a solenoid assembly installed on an upper surface thereof and a lower recessed groove recessed toward an upper portion thereof on a lower surface thereof; A casing, a sleeve fixed inside the casing, a coil wound around the outer circumferential surface of the sleeve, a core fixed inside the sleeve, a plunger mounted on the bottom of the core, and a valve face seated on the valve seat at the bottom of the plunger. A solenoid assembly coupled to the upper body upper surface, Low temperature startability is improved purge valve, characterized in that it comprises a PTC assembly installed in the recess groove of the upper body to heat the flow path. The method of claim 1, The upper body has an upper inlet groove is formed from the upper surface to the valve seat, the end of the diaphragm is fixed to the upper surface of the upper inlet groove, and the plunger is fixed to the center of the diaphragm improved low temperature startability purge valve. The method according to claim 1 or 2, The PTC assembly includes a case fixed to the outer peripheral surface of the flow path, a PTC element fixed to the inside of the case, a spring for contacting the PTC element to the case, and a body fixed to the bottom of the case. Start-up purge valve. The method of claim 3, The flow passage is a purge valve with improved low temperature startability, characterized in that the protruding flow path is formed to protrude to the bottom of the upper body, the protruding flow path is fitted to the flow path fitting portion. The method of claim 3, The lower body has a first O-ring groove is formed on the outside of the flow path fitting portion, the second O-ring groove is formed on the upper surface of the lower body spaced apart from the first O-ring groove, A purge valve having improved low temperature startability, wherein the first O-ring and the second O-ring are respectively fixed to the first O-ring groove and the second O-ring groove.

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