KR101877293B1 - High pressure regulator - Google Patents

Abstract

A high pressure regulator comprising: a body in which an inlet for introducing high-pressure fuel into a side face and an outlet for exhausting reduced-pressure fuel are formed respectively and a pressure-reducing chamber for reducing pressure of high-pressure fuel to a preset pressure is formed, And a pressure reducing unit installed in the inside of the pressure reducing chamber and the upper cover for reducing pressure by moving high pressure fuel through the orifice, and at one side of the upper cover, air is sucked during the lifting operation of the shaft provided in the pressure reducing unit, And a filter for blocking the inflow of moisture, oil, and foreign substances into the vent hole is installed in an adhesive manner, so that the high pressure The fuel is depressurized to a preset outlet pressure and fed to the stack, Oil, it is possible to prevent foreign objects such as dust introduced.

Description

{HIGH PRESSURE REGULATOR}

The present invention relates to a high-pressure regulator, and more particularly, to a high-pressure regulator applied to a hydrogen fuel cell vehicle to decompress high-pressure hydrogen to a predetermined outlet pressure.

Generally, a Fuel Cell Electric Vehicle (FCEV) generates electricity by electrochemically using oxygen and hydrogen in a stack to convert the chemical energy of the fuel directly into electrical energy and use it as a power source.

Such a hydrogen fuel cell vehicle is an ideal technology in which fuel and air can be supplied from the outside and can be continuously generated regardless of the capacity of the battery, so that the efficiency is high and the pollutant is hardly discharged.

A hydrogen fuel cell vehicle supplies hydrogen fuel to the stack via a high-pressure regulator and a low-pressure regulator in a fuel tank, and the hydrogen blower includes a pump and various valves connected to a low-pressure regulator.

At the same time, the hydrogen fuel cell vehicle is equipped with a rapid sea ice water tank, an all animal pump, a thermostat, a stack cooling radiator, an air conditioner condenser, an electric refrigerant compressor, a water tank, a humidifier, a drive motor, .

The fuel supply system of the hydrogen fuel cell vehicle corresponds to the engine of a general gasoline and diesel vehicle, and is located at the upper side of the vehicle.

For example, the present applicant has filed a patent application for a fuel supply system of a hydrogen fuel cell vehicle, a regulator, and a control technique thereof, in many of the following Patent Documents 1 to 4 and the like.

As described above, since the high-pressure regulator applied to the hydrogen fuel cell vehicle handles high-pressure hydrogen of about 700 bar, stable outlet pressure, sufficient pressure resistance and internal air tightness are very important.

Korea Patent Korean Patent Registration No. 10-1134645 (Announcement on April 9, 2012) Korea Patent Registration No. 10-1134647 (Announcement on April 19, 2012) Korean Patent Registration No. 10-0946204 (published on Mar. 8, 2010) Korean Patent Registration No. 10-1072361 (issued on October 12, 2011)

However, the conventional high-voltage regulator has a mounting height close to the road surface, so that there is a problem that foreign matter such as debris of the road or water or dust due to immersion or high-pressure spraying flows into the high-pressure regulator.

In the high-pressure regulator according to the related art, an instantaneous pressure drop occurs due to the characteristics of the mechanical regulator, and a coil spring having a circular cross section is applied to the reduced pressure portion, so that the decompression performance becomes unstable due to insufficient restoring force.

In addition, since the high-pressure regulator according to the related art is assembled by connecting the inlet and outlet connectors, the over-pressure relief valve, the fuel discharge valve, and the like to the respective bodies, there is a problem that workability in assembling the vehicle is deteriorated.

In addition, the high-voltage regulator according to the related art causes intermittent internal leakage as the shaft rotates finely during the driving operation of the shaft, and the durability of the high-voltage regulator is lowered due to abrasion of parts moving up and down.

SUMMARY OF THE INVENTION An object of the present invention is to provide a high-pressure regulator for reducing the pressure of hydrogen supplied from a fuel tank to a stack to a preset set pressure.

It is another object of the present invention to provide a high-voltage regulator that can extend its service life by improving durability by applying a waterproof and dustproof structure to a high-voltage regulator mounted in a lower portion of a vehicle.

It is still another object of the present invention to provide a high-pressure regulator capable of preventing an instantaneous pressure drop and improving the pressure reduction performance.

In order to achieve the above object, the high-pressure regulator according to the present invention is characterized in that an inlet for introducing high-pressure fuel into the side surface and an outlet for discharging the reduced-pressure fuel are formed respectively, and a high- And a decompression unit installed in the decompression chamber and the upper cover for moving the high pressure fuel through the orifice so as to decompress the decompression chamber, wherein the decompression unit is disposed at one side of the decompression chamber, And a filter for blocking the inflow of moisture, oil, and foreign matter into the vent hole is installed in an adhesive manner in the vent hole .

As described above, according to the high-pressure regulator of the present invention, high-pressure fuel supplied from the fuel tank can be supplied to the stack at a preset outlet pressure by reducing the pressure.

According to the present invention, a filter is provided on one side of the upper cover to prevent foreign substances such as moisture, oil, and dust from entering from the outside due to the mounting height of the high-voltage regulator installed in the lower portion of the vehicle .

According to the present invention, the reduced pressure is transmitted to the outlet port along the first flow path formed obliquely inside the body, the upper end of the shaft formed of a streamlined curved surface and the lower surface of the piston, thereby minimizing fluid resistance and intermittently occurring during operation The internal fuel shortage state can be effectively prevented.

Further, according to the present invention, it is possible to provide an inlet-side filter and a buffer member at the inlet port to compensate for the gap between the inlet port and the inlet-side filter.

In addition, according to the present invention, it is possible to provide a rotation preventing pin at one side of the shaft to prevent fine rotation during shaft lifting operation, and the support plate to which the shaft is coupled is made of a synthetic resin material, The durability of the high-pressure regulator can be improved by preventing the shaft from being damaged due to friction with the support plate.

According to the present invention, a safety valve incorporating an overpressure relieving valve and a fuel discharge valve can be applied to quickly discharge the fuel in an overpressure state to the outside through a safety valve when an overpressure is generated, It is possible to obtain an effect that the safety can be improved.

1 is a perspective view of a high-voltage regulator according to a preferred embodiment of the present invention,
2 is a sectional view taken along the line A-A 'shown in Fig. 1,
3 is a cross-sectional view taken along the line B-B 'shown in Fig.
4 is a cross-sectional view taken along the line C-C 'shown in Fig.

Hereinafter, a high-pressure regulator according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a high-voltage regulator according to a preferred embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line A-A 'shown in FIG. 1, Sectional view.

Hereinafter, terms indicating directions such as 'left', 'right', 'forward', 'rearward', 'upward' and 'downward' are defined as indicating respective directions based on the states shown in the respective drawings do.

In the present embodiment, a high-pressure regulator applied to a hydrogen fuel cell vehicle will be described. However, the present invention is not limited thereto. The present invention is also applicable to a high-pressure regulator that decompresses various kinds of high-pressure gaseous fuels such as an LPG It should be noted that the present invention can also be applied to a regulator.

1 to 3, the high-pressure regulator 10 according to the preferred embodiment of the present invention has an inlet 21 through which high-pressure fuel flows into the side surface and an outlet 22 through which the reduced- A body 20 in which a decompression chamber 23 is formed in which a high pressure fuel is decompressed to a preset pressure, an upper cover 30 coupled to an upper portion of the body 20, And a decompression unit 40 for decompressing the high-pressure fuel by moving the high-pressure fuel through the orifice.

In addition, the high-pressure regulator 10 according to the preferred embodiment of the present invention includes a high-pressure regulator 10 coupled to a lower portion of the body 20 and configured to pressurize fuel in an overpressure state in which the pressure of fuel discharged through the discharge port 22 exceeds a predetermined reference pressure And may further include a safety valve 50 for discharging the gas.

The body 20 may be formed in a substantially cylindrical shape having an upper surface and a lower surface, respectively, so as to form a decompression chamber 23 therein.

An inlet 21 through which the fuel flows and a discharge port 22 through which the fuel is discharged are formed in the side surface of the body 20. The inlet 21 and the outlet 22 are respectively provided with modular The inlet port 24 and the outlet port 25 can be combined.

The inlet port 24 and the outlet port 25 are coupled to the inlet 21 and the outlet 22 respectively and an inlet filter 241 for removing foreign substances contained in the fuel is provided at the inner end of the inlet port 24 Can be installed.

A circular ring shaped buffer member 242 may be provided between the inlet port 21 and the inlet port 24 to compensate for the gap between the inlet filter 241 and the inlet port 24.

The buffer member 242 is made of an elastic synthetic resin material or a metal material and is elastically deformed when the inlet port 24 is joined to compensate for the gap between the inlet filter 241 and the inlet port 24, Function.

A quick connector 251 may be provided in the outlet port 25 to easily connect a connection pipe (not shown) connected to the stack.

Of course, the present invention can also be modified to apply a quick connector to the inlet port 24 as well.

The depressurizing chamber 23 is a space in which the depressurizing portion 40 is installed and includes a first mounting space 231 in which the shaft 41 of the depressurizing portion 40 is to be installed, A decompression plate 43 having an orifice 42 to be opened and closed by the decompression member 44 and a second installation space 232 to which the decompression member 44 is installed.

A sealing member 49 for sealing the outer circumferential surface of the lower end of the shaft 41 and the first installation space 231 and the third flow path 29 may be provided at the lower end of the first installation space 231.

A valve port 26 to which a safety valve 50 is coupled may be provided at a lower end of the body 20.

A first flow path 27 for delivering the reduced pressure fuel in the decompression chamber 23 to the outlet port 25 and a part of the fuel discharged through the outlet port 25 are connected to the safety valve 50, The second flow path 28 can be formed.

The valve port 26 is connected to a third flow path 29 communicating with the first installation space 231 of the decompression chamber 23 and the lower end of the second flow path 28. Inside the valve port 26, An upper end portion of the upper case 50 can be inserted.

2, the first and second flow passages 27 and 28 pass through the orifices 42, respectively, in consideration of the characteristics of the fuel flowing along the outer peripheral surface of the shaft 41, At predetermined angles, respectively.

Therefore, the decompressed fuel in the decompression chamber 23 can smoothly move toward the outlet port 25 and the valve port 26 through the first and second flow paths 27 and 28, which are formed in an inclined manner.

As described above, according to the present invention, the flow path formed inside the body is inclined so that the fluid resistance can be minimized and the internal fuel shortage that occurs intermittently during operation can be effectively prevented.

On the other side of the body 20, there can be provided a sensor port 201 to which a measurement sensor (not shown) is coupled to measure the pressure of the depressurized fuel, as shown in Figs.

Between the decompression chamber 23 and the sensor port 21 is formed a connection passage 202 connecting the decompression chamber 23 and the sensor port 201 so as to measure the pressure of the fuel depressurized by the measurement sensor .

Therefore, the measurement sensor measures the pressure of the depressurized fuel, and a control unit (not shown) provided in the vehicle receives the measurement signal of the measurement sensor and confirms the pressure of the depressurized fuel to determine whether the normal operation is performed.

The body 20 is made of a metal material such as aluminum that is heat-treated like AL6061-T6 for the purpose of improving workability and satisfying hydrogen embrittlement, Can be surface-treated by an oxidation method.

The upper cover 30 is formed in a cylindrical shape with an opened lower surface and an upper spring 30 for providing a restoring force to the piston 45 and the piston 45 of the pressure- 46 may be installed.

A vent hole 31 for sucking or discharging air is formed at one side of the upper cover 30 so that the shaft 41 can move up and down smoothly. In the process of introducing outside air into the vent hole 31, And a filter 32 for blocking foreign matter such as oil or dust from entering.

The filter 32 is made of a synthetic resin material having excellent heat resistance and chemical resistance, such as polytetrafluoroethylene, and can be installed in the vent hole 31 by an adhesive method.

Of course, the present invention is not limited thereto, and may be modified to apply a wire compression mesh filter.

However, the wire compression mesh filter is capable of filtering foreign matter of a recipient, but has a limitation in completely blocking dust, moisture, etc. of small particles.

As described above, according to the present invention, since the filter is attached to the vent hole formed in the upper cover in an adhesive manner, it is possible to prevent the debris of the road due to the debris of the road, the water caused by high- It is possible to prevent the foreign matter from entering, and the filter can be easily installed.

A tension adjusting means 33 for adjusting the tension of the upper spring 46 applied to the depressurizing portion 40 described below may be fastened to the upper end of the upper cover 30. [

The depressurizing portion 40 includes a shaft 41 which is vertically movable in the depressurizing chamber 23 so as to be vertically movable, an orifice 42 at the center and a second installation space 232 of the depressurizing chamber 23, A piston 45 which moves up and down according to the pressure of the reduced fuel supplied into the pressure reducing chamber 23 and a piston 45 which provides a restoring force to the piston 45, (46).

The shaft 41 is formed to extend along the vertical direction, and the central portion of the shaft 41 may be formed to have a larger diameter than the upper end and the lower end to close the orifice 42.

The pressure-reducing plate 43 is formed in a disk shape corresponding to the end surface of the pressure-reducing chamber 23, and the pressure-reducing member 44 is formed in a substantially cylindrical shape with an open top surface, Can be press-fitted into the inner peripheral surface of the decompression chamber (23) and fixed.

An orifice 42 may be formed at the center of the pressure-reducing plate 43 and the pressure-reducing member 44.

The upper end of the shaft 41 may be installed to contact the lower surface of the piston 45 through the pressure reducing plate 43 and the orifice 42 of the pressure reducing member 44.

One or more O-rings may be provided on the outer circumferential surface of the piston 45 to seal the space between the inner circumferential surface of the upper cover 30 and the piston 45. The O-

The piston 45 moves up and down in accordance with the pressure change of the fuel while passing through the orifice 42 and the shaft 41 moves up and down in conjunction with the lifting operation of the piston 45 to open or open the orifice 42 Closing.

Here, the upper end of the shaft 41 and the lower surface of the piston 45 contacting the upper end of the shaft 41 may be formed into a streamlined curved surface having a substantially trumpet shape so as to minimize the resistance when the fuel is moved.

As described above, according to the present invention, the upper end of the shaft and the lower surface of the piston are formed into a streamlined curved surface to minimize the fluid resistance, thereby effectively preventing the internal fuel shortage that occurs intermittently during operation.

According to the experimental results, as described in the present embodiment, the first and second flow paths 27 and 28 are inclined, and the upper end of the shaft 41 and the lower surface of the piston 45 are formed into a streamlined curved surface It is found that the pressure loss is improved by about 90% as compared with the case where the first and second flow paths 27 and 28 are vertically formed and the upper surface of the shaft 41 and the lower surface of the piston 45 are formed in a plane there was.

The pressure reducing portion 40 includes an intermediate spring 47 provided at the lower portion of the shaft 41 and providing an elastic force to the shaft 42 to close the orifice 42 and a support plate 48 and a sealing member 49 for sealing between the pressure-reducing chamber 23 and the valve port 14.

The sealing member 49 is provided on the body 20 so as to maintain a low pressure in the lower portion of the shaft 41, including a subsidiary portion for tightening airtightness in the spring.

In order to maintain the air-tightness in the variable pressure range at all times, the spring of the energized seal may be configured to accommodate an elastic part such as an SUS-type thin spring on the blade part of the arc-shaped resin material body part.

Thus, the sealing member 49 is pressed against the body 20 and the shaft 41 at the same time in a pressurized state, and maintains a seal between the high pressure and the low pressure at the lower end, which acts in most areas of the shaft 41.

The support plate 48 is formed in a substantially disc shape and an insertion hole into which the lower end of the shaft 41 is inserted may be formed at the center of the support plate 48.

The support plate 48 may be disposed at the upper end of the sealing member 49 coupled to the lower end of the first installation space 231 of the decompression chamber 23.

The support plate 48 is made of a material such as polyether ether ketone to prevent damage to the outer surface of the shaft due to friction with the support plate 48 during lifting and lowering operation of the shaft 41, And can be made of a synthetic resin material having excellent impact resistance.

As described above, according to the present invention, since the support plate into which the lower end portion of the shaft is inserted is made of a synthetic resin material, damage to the shaft due to friction with the support plate during the lifting operation of the shaft can be prevented.

Accordingly, the present invention can prevent high-pressure sealing performance and internal pressure shortage due to shaft damage.

4 is a cross-sectional view taken along the line C-C 'shown in FIG.

As shown in FIGS. 3 and 4, a rotation preventing pin 411 may be installed on one side of the center of the shaft 41 to prevent rotation of the shaft 41.

One end of the rotation preventing pin 411 is coupled to one side of the central portion of the shaft 41 and the other end of the rotation preventing pin 411 is inserted into the second installation space 232 of the decompression chamber 23 along the up- And can be inserted into the formed moving groove 233.

As described above, according to the present invention, the anti-rotation fin is provided on one side of the shaft and the movement groove is formed on one side of the vacuum chamber to prevent the minute rotation during the lifting operation of the shaft, so that the sealing point can be maintained for a long time.

Of course, the present invention may be modified so that one end of the anti-rotation fin is coupled to one side of the second actual space and the other end of the anti-rotation fin is inserted into the movement groove formed in the shaft.

The safety valve 50 is separated from the body 20 by a manual operation of a worker and a relief valve for relieving overpressure by releasing fuel when an over-overpressure is generated inside the high-pressure regulator 10 and discharging the fuel inside the high-pressure regulator 10 A purge valve function can be integrally provided.

To this end, the safety valve 50 includes a guide body 51 coupled to the valve port 26 of the body 20, a valve body 52 coupled to the upper end of the guide body 51, A valve body 52 for opening the valve port 26 and a lower spring 53 provided inside the valve body 52 and providing an elastic force to the valve body 52 and a lower portion of the guide body 51 And a discharge line 54 for discharging fuel during the opening operation of the valve body 52.

In addition, the safety valve 50 includes a pipe cap 55 coupled to the lower end of the discharge pipe 54 and a detachment pin 56 for preventing the discharge pipe 54 from being completely separated from the guide body 51 .

The upper end of the guide body 51 may have a smaller diameter than the lower end of the guide body 51 and may be coupled to the valve port 26. [

The valve body 52 is formed in a substantially cylindrical shape with a bottom surface opened. A molding sheet 521 for closing the third flow path 29, which is connected to the inner space of the valve port 26, Can be installed.

At least one inflow hole 522 may be formed in the side surface of the valve body 52 to allow the fuel discharged into the valve port 26 to flow in.

The lower spring 53 is disposed inside the valve body 52 and the lower end of the lower spring 52 can be supported at the upper end of the discharge pipe 54 coupled to the guide body 51.

Thus, when the pressure of the fuel that is transmitted through the third flow path 29 exceeds the predetermined pressure in a state where the third flow path 29 is closed by the elastic force of the lower spring 53 The lower spring 53 descends while elastically deforming so as to decrease the length thereof, thereby opening the third flow path 29.

As described above, according to the present invention, the overpressure state of the fuel can be discharged through the discharge pipe by using the safety valve to prevent the fuel in the overpressure state from being supplied to the stack, thereby improving the safety.

An annular rib 541 protruding outwardly corresponding to the inner circumferential surface of the guide body 51 is formed on the outer circumferential surface of the upper end of the discharge pipe 54. The central portion of the discharge pipe 54 is formed to have a larger diameter than the upper end .

The annular rib 541 may be provided with an O-ring that hermetically seals between the inner circumferential surface of the guide body 51 and the discharge pipe 54.

The detachment pin 56 is installed through one side of the guide body 51 and the inner end of the detachment pin 56 is connected to the moving space formed between the annular rib 541 of the discharge pipe 54 and the center portion 542, respectively.

The distance by which the discharge pipe 54 is separated from the body 20 in the purge valve function for discharging the fuel inside the high-pressure regulator 10 can be limited to the moving space 542 between the annular rib 541 and the center portion.

As described above, according to the present invention, the discharge pipe is prevented from being completely separated from the body by using the detachment pin, so that the valve body and the lower spring installed inside the guide body are separated from each other, thereby preventing problems such as loss.

The pipe cap 55 is coupled to the lower end of the discharge pipe 54 and can be detachably coupled to the discharge pipe 55 when the pressure exceeds a preset pressure to release the fuel when overpressure is generated.

Accordingly, the operator can easily check whether or not the over-pressure is generated by confirming whether or not the pipe cap 55 is detached when the vehicle is inspected. If the over-pressure is confirmed, the operator can perform precise diagnosis of the vehicle.

The pipe cap 55 is connected to the discharge pipe 54 by a connecting member 57 whose one end is connected to the pipe cap 55 to prevent loss when separated from the discharge pipe 54 54).

Next, the coupling relationship and the operation method of the high-voltage regulator according to the preferred embodiment of the present invention will be described in detail.

The operator is provided with the sealing member 49 in the decompression chamber 23 formed in the body 20 and the supporting plate 48, the intermediate spring 47, the shaft 41, The plate 43 and the pressure-reducing member 44 are sequentially installed.

The operator places the piston 45 and the upper spring 46 in contact with the upper end of the shaft 41 and connects the upper cover 30 to the upper portion of the body 20.

At this time, a filter 32 is installed in the vent hole 31 formed at one side of the upper cover 30 to prevent foreign substances such as moisture, oil, dust from being introduced into the inside.

The operator inserts the guide body 51 of the safety valve 50 into the valve port 26 formed at the lower end of the body 20 and inserts the valve body 52 and the lower spring 53 and the discharge pipe 54 in this order.

Finally, the operator installs the inlet port 24, the outlet port 25, and the sensor port 201 on each side of the body 20 to complete the assembly of the high-pressure regulator 10, and then install the same in the vehicle.

At this time, the inner end of the inlet port 24 is resiliently deformed by the engaging force when the inlet filter 241 and the inlet port 24 are coupled to each other, and the gap between the inlet filter 241 and the inlet port 24 is compensated A member 242 may be provided.

And a quick connector 251 can be provided in the outlet port 25 so that the relative pipe can be easily coupled.

When the high-pressure fuel flows into the high-pressure regulator 10 through the inlet port 24, the piston 45 and the shaft 41 move up and down through the orifice 42 according to the pressure of the introduced fuel So that the fuel is decompressed and supplied to the stack.

At this time, the measurement sensor coupled to the sensor port 201 measures the pressure of the decompressed fuel and transfers it to the control unit of the vehicle.

The safety valve 50 receives the reduced pressure fuel through the second and third flow paths 28 and 29 connected to the outlet port 25 and when the pressure of the reduced pressure fuel is in an overpressure state exceeding a preset pressure, The valve body 52 descends and discharges the fuel in an overpressure state through the discharge pipe 54 to the outside.

At this time, the reduced pressure fuel passing through the orifice 42 moves along the upper end of the shaft 41 formed of a streamlined curved surface and the lower surface of the piston 45, and the first flow path 28 formed inclined inside the body 20, To the outlet port 25.

As described above, according to the present invention, the reduced pressure fuel is delivered to the outlet port along the upper end of the shaft formed of a streamlined curved surface and the lower surface of the piston and the first flow path inclined in the body, thereby minimizing fluid resistance and intermittently occurring during operation The internal fuel shortage state can be effectively prevented.

The filter 32 installed in the upper cover 30 blocks foreign substances such as moisture, oil and dust from entering from the outside due to the mounting height of the high-voltage regulator 10 installed at the lower part of the vehicle.

Through the above-described process, the present invention can reduce the high-pressure fuel supplied from the fuel tank to a predetermined outlet pressure and supply the stack to the stack.

Further, due to the mounting height of the high-voltage regulator installed in the lower part of the vehicle, it is possible to prevent foreign substances such as moisture, oil, dust from being introduced from the outside.

Although the invention made by the present inventors has been described concretely with reference to the above embodiments, the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

The present invention is applied to a high-pressure regulator technique for reducing the pressure of high-pressure fuel to a preset outlet pressure.

10: High-voltage regulator 20: Body
201: sensor port 202: connection channel
21: inlet 22: outlet
23: decompression chamber 231, 232: first and second installation spaces
233: moving groove 24: inlet port
241: inlet filter 242: buffer member
25: Exit port 251: Quick connector
26: valve ports 27 to 29: first to third flow paths
30: upper cover 31: air vent
32: filter 33: tension adjusting means
40: Pressure reducing portion 41: Shaft
411; Rotation prevention pin 42: orifice
43: Pressure reducing plate 44: Pressure reducing member
45: piston 46: upper spring
47: intermediate spring 48: support plate
49: sealing member 50: safety valve
51: guide body 52: valve body
521: Molding sheet 522: Inflow hole
53: lower spring 54: discharge pipe
541: annular rib 55: piping cap
56: detachment pin 57: connecting member

Claims (10)

A body formed with an inlet port through which high-pressure fuel flows into the side surface and an outlet port through which exhausted pressure-reduced fuel are respectively formed, and a decompression chamber for decompressing high-pressure fuel to a preset pressure,
An upper cover coupled to an upper portion of the body,
And a decompression unit installed inside the decompression chamber and the upper cover for decompressing the high pressure fuel by moving the high pressure fuel through the orifice,
A vent hole for sucking or discharging air is formed at one side of the upper cover during a lifting operation of the shaft provided in the pressure reducing portion,
A filter for blocking the inflow of moisture, oil, and foreign substances into the vent hole is installed in an adhesive manner,
The depressurizing portion includes a shaft installed in the depressurizing chamber so as to be able to move up and down along the vertical direction,
A pressure reducing member and a pressure reducing member each having an orifice formed at a central portion thereof and installed in the pressure reducing chamber,
A piston moving up and down in accordance with the pressure of the decompressed fuel in the decompression chamber and
And an upper spring for providing a restoring force to the piston,
The upper end of the shaft and the lower surface of the piston are formed into a streamlined curved surface having a trumpet shape so as to minimize the resistance when the fuel is moved,
The pressure-reducing chamber includes a first installation space in which the shaft is installed,
And a second installation space in which the pressure reducing plate and the pressure reducing member, which are provided with orifices for opening and closing by the lifting operation of the shaft,
A first flow path for delivering the reduced pressure fuel in the decompression chamber to the outlet port coupled to the discharge port,
A second flow path for transmitting a part of the fuel supplied to the outlet port to the safety valve is formed,
Wherein the first and second flow paths are each formed to be inclined so as to minimize fluid resistance during fuel transfer. The method according to claim 1,
An overpressure-releasing function coupled to a lower portion of the body and discharging fuel in an overpressure state in which the pressure of the fuel discharged through the outlet exceeds a preset reference pressure, Further comprising a safety valve incorporating a discharge function,
The safety valve includes a guide body coupled to a valve port provided at a lower end of the body,
A valve body coupled to an upper end of the guide body and opening the valve port when overpressure is generated in a state where the valve port is closed,
A lower spring installed inside the valve body and supported at an upper end of a discharge pipe whose lower end is coupled to the guide body to provide an elastic force to the valve body,
And a discharge pipe coupled to a lower portion of the guide body and discharging fuel upon opening of the valve body. 3. The method of claim 2,
The safety valve includes a pipe cap coupled to a lower end of the discharge pipe
Further comprising a detachment pin for preventing said discharge pipe from being completely separated from said guide body,
Wherein the pipe cap is detachably coupled to the discharge pipe when a predetermined pressure or more is exceeded so as to release fuel in an overpressure state when an overpressure is generated,
Wherein the detachment pin is installed through one side of the guide body,
Wherein an inner end of the detachment pin is inserted into a moving space formed between an annular rib formed at an upper end of the discharge pipe and a middle portion thereof. delete delete 4. The method according to any one of claims 1 to 3,
The pressure reducing portion includes an intermediate spring installed at a lower portion of the shaft and providing an elastic force to the shaft to close the orifice,
A support plate for supporting a lower end of the intermediate spring,
Further comprising a sealing member sealing between the pressure-reducing chamber and a valve port provided at a lower end of the body,
And the valve port is connected to a third flow path communicating with the first installation space of the decompression chamber and the lower end of the second flow path. The method according to claim 6,
A rotation preventing pin for preventing the rotation of the shaft is provided on one side of the shaft,
One end of the anti-rotation fin is coupled to one side of the shaft
And the other end of the anti-rotation fin is inserted into a movement groove formed along one side of the decompression chamber along a vertical direction. The method according to claim 6,
Wherein the support plate is made of a synthetic resin material so as to prevent damage to the outer surface of the shaft due to friction during the lifting operation of the shaft. 4. The method according to any one of claims 1 to 3,
An inlet-side filter for removing foreign substances contained in the fuel is provided at an inner end of the inlet port coupled to the inlet,
A buffer member is provided between the inlet port and the inlet port to compensate for a gap between the inlet filter and the inlet port,
And a quick connector to which a relative pipe is coupled is installed in the outlet port. 4. The method according to any one of claims 1 to 3,
The body is manufactured by a forging molding method using a heat-treated aluminum material,
Wherein the surface treatment is performed by aluminum anodic oxidation.

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